Improve cross-compilation from midipix.

Reported by Ørjan Malde <red@foxi.me> at
<https://lists.gnu.org/archive/html/bug-gnulib/2023-02/msg00131.html>.

Since midipix consists of musl libc based on an emulation of Linux system
calls, for pure libc functionality it can be treated like musl libc.

* m4/calloc.m4 (_AC_FUNC_CALLOC_IF): Treat midipix like systems with
musl libc.
* m4/cbrtl.m4 (gl_FUNC_CBRTL): Likewise.
* m4/ceil.m4 (gl_FUNC_CEIL): Likewise.
* m4/ceilf.m4 (gl_FUNC_CEILF): Likewise.
* m4/ceill.m4 (gl_FUNC_CEILL): Likewise.
* m4/exp2l.m4 (gl_FUNC_EXP2L): Likewise.
* m4/expl.m4 (gl_FUNC_EXPL): Likewise.
* m4/expm1.m4 (gl_FUNC_EXPM1): Likewise.
* m4/expm1f.m4 (gl_FUNC_EXPM1F): Likewise.
* m4/expm1l.m4 (gl_FUNC_EXPM1L): Likewise.
* m4/fclose.m4 (gl_FUNC_FCLOSE_STDIN): Likewise.
* m4/fdopendir.m4 (gl_FUNC_FDOPENDIR): Likewise.
* m4/ffsll.m4 (gl_FUNC_FFSLL): Likewise.
* m4/floor.m4 (gl_FUNC_FLOOR): Likewise.
* m4/floorf.m4 (gl_FUNC_FLOORF): Likewise.
* m4/fmod.m4 (gl_FUNC_FMOD): Likewise.
* m4/fmodf.m4 (gl_FUNC_FMODF): Likewise.
* m4/fmodl.m4 (gl_FUNC_FMODL): Likewise.
* m4/fnmatch.m4 (gl_FUNC_FNMATCH_POSIX): Likewise.
* m4/fopen.m4 (gl_FUNC_FOPEN_GNU): Likewise.
* m4/fpurge.m4 (gl_FUNC_FPURGE): Likewise.
* m4/getdelim.m4 (gl_FUNC_GETDELIM): Likewise.
* m4/getline.m4 (gl_FUNC_GETLINE): Likewise.
* m4/hypot.m4 (gl_FUNC_HYPOT): Likewise.
* m4/hypotf.m4 (gl_FUNC_HYPOTF): Likewise.
* m4/hypotl.m4 (gl_FUNC_HYPOTL): Likewise.
* m4/iconv_open-utf.m4 (gl_FUNC_ICONV_OPEN_UTF_SUPPORT): Likewise.
* m4/log.m4 (gl_FUNC_LOG): Likewise.
* m4/log10.m4 (gl_FUNC_LOG10): Likewise.
* m4/log10f.m4 (gl_FUNC_LOG10F): Likewise.
* m4/log10l.m4 (gl_FUNC_LOG10L_WORKS): Likewise.
* m4/log1p.m4 (gl_FUNC_LOG1P): Likewise.
* m4/log1pf.m4 (gl_FUNC_LOG1PF): Likewise.
* m4/log1pl.m4 (gl_FUNC_LOG1PL, gl_FUNC_LOG1PL_WORKS): Likewise.
* m4/log2.m4 (gl_FUNC_LOG2): Likewise.
* m4/log2f.m4 (gl_FUNC_LOG2F): Likewise.
* m4/log2l.m4 (gl_FUNC_LOG2L_WORKS): Likewise.
* m4/logf.m4 (gl_FUNC_LOGF): Likewise.
* m4/logl.m4 (gl_FUNC_LOGL_WORKS): Likewise.
* m4/malloc.m4 (_AC_FUNC_MALLOC_IF): Likewise.
* m4/mkstemp.m4 (gl_FUNC_MKSTEMP): Likewise.
* m4/modf.m4 (gl_FUNC_MODF): Likewise.
* m4/modff.m4 (gl_FUNC_MODFF): Likewise.
* m4/modfl.m4 (gl_FUNC_MODFL): Likewise.
* m4/musl.m4 (gl_MUSL_LIBC): Likewise.
* m4/perror.m4 (gl_FUNC_PERROR): Likewise.
* m4/posix_spawn.m4 (gl_POSIX_SPAWN_SECURE,
gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDCLOSE,
gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDDUP2,
gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDOPEN): Likewise.
* m4/printf.m4 (gl_PRINTF_SIZES_C99, gl_PRINTF_INFINITE,
gl_PRINTF_INFINITE_LONG_DOUBLE, gl_PRINTF_DIRECTIVE_A,
gl_PRINTF_DIRECTIVE_F, gl_PRINTF_FLAG_ZERO, gl_SNPRINTF_TRUNCATION_C99,
gl_SNPRINTF_RETVAL_C99, gl_SNPRINTF_DIRECTIVE_N,
gl_VSNPRINTF_ZEROSIZE_C99): Likewise.
* m4/pthread_rwlock_rdlock.m4 (gl_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER):
Likewise.
* m4/putenv.m4 (gl_FUNC_PUTENV): Likewise.
* m4/realloc.m4 (_AC_FUNC_REALLOC_IF): Likewise.
* m4/remainder.m4 (gl_FUNC_REMAINDER): Likewise.
* m4/remainderf.m4 (gl_FUNC_REMAINDERF): Likewise.
* m4/remainderl.m4 (gl_FUNC_REMAINDERL, gl_FUNC_REMAINDERL_WORKS):
Likewise.
* m4/rintl.m4 (gl_FUNC_RINTL): Likewise.
* m4/round.m4 (gl_FUNC_ROUND): Likewise.
* m4/roundf.m4 (gl_FUNC_ROUNDF): Likewise.
* m4/roundl.m4 (gl_FUNC_ROUNDL): Likewise.
* m4/setenv.m4 (gl_FUNC_SETENV): Likewise.
* m4/setlocale_null.m4 (gl_FUNC_SETLOCALE_NULL): Likewise.
* m4/signbit.m4 (gl_SIGNBIT): Likewise.
* m4/stpncpy.m4 (gl_FUNC_STPNCPY): Likewise.
* m4/strerror.m4 (gl_FUNC_STRERROR, gl_FUNC_STRERROR_0): Likewise.
* m4/strtod.m4 (gl_FUNC_STRTOD): Likewise.
* m4/strtold.m4 (gl_FUNC_STRTOLD): Likewise.
* m4/trunc.m4 (gl_FUNC_TRUNC): Likewise.
* m4/truncf.m4 (gl_FUNC_TRUNCF): Likewise.
* m4/truncl.m4 (gl_FUNC_TRUNCL): Likewise.
* m4/ungetc.m4 (gl_FUNC_UNGETC_WORKS): Likewise.
* m4/wcwidth.m4 (gl_FUNC_WCWIDTH): Likewise.

71 files changed, 744 insertions, 655 deletions

diff --git a/ChangeLog b/ChangeLog
index 31aa9fc6ca..386fe23846 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,91 @@
+2023-02-17  Bruno Haible  <bruno@clisp.org>
+
+	Improve cross-compilation from midipix.
+	Reported by Ørjan Malde <red@foxi.me> at
+	<https://lists.gnu.org/archive/html/bug-gnulib/2023-02/msg00131.html>.
+	Since midipix consists of musl libc based on an emulation of Linux system
+	calls, for pure libc functionality it can be treated like musl libc.
+	* m4/calloc.m4 (_AC_FUNC_CALLOC_IF): Treat midipix like systems with
+	musl libc.
+	* m4/cbrtl.m4 (gl_FUNC_CBRTL): Likewise.
+	* m4/ceil.m4 (gl_FUNC_CEIL): Likewise.
+	* m4/ceilf.m4 (gl_FUNC_CEILF): Likewise.
+	* m4/ceill.m4 (gl_FUNC_CEILL): Likewise.
+	* m4/exp2l.m4 (gl_FUNC_EXP2L): Likewise.
+	* m4/expl.m4 (gl_FUNC_EXPL): Likewise.
+	* m4/expm1.m4 (gl_FUNC_EXPM1): Likewise.
+	* m4/expm1f.m4 (gl_FUNC_EXPM1F): Likewise.
+	* m4/expm1l.m4 (gl_FUNC_EXPM1L): Likewise.
+	* m4/fclose.m4 (gl_FUNC_FCLOSE_STDIN): Likewise.
+	* m4/fdopendir.m4 (gl_FUNC_FDOPENDIR): Likewise.
+	* m4/ffsll.m4 (gl_FUNC_FFSLL): Likewise.
+	* m4/floor.m4 (gl_FUNC_FLOOR): Likewise.
+	* m4/floorf.m4 (gl_FUNC_FLOORF): Likewise.
+	* m4/fmod.m4 (gl_FUNC_FMOD): Likewise.
+	* m4/fmodf.m4 (gl_FUNC_FMODF): Likewise.
+	* m4/fmodl.m4 (gl_FUNC_FMODL): Likewise.
+	* m4/fnmatch.m4 (gl_FUNC_FNMATCH_POSIX): Likewise.
+	* m4/fopen.m4 (gl_FUNC_FOPEN_GNU): Likewise.
+	* m4/fpurge.m4 (gl_FUNC_FPURGE): Likewise.
+	* m4/getdelim.m4 (gl_FUNC_GETDELIM): Likewise.
+	* m4/getline.m4 (gl_FUNC_GETLINE): Likewise.
+	* m4/hypot.m4 (gl_FUNC_HYPOT): Likewise.
+	* m4/hypotf.m4 (gl_FUNC_HYPOTF): Likewise.
+	* m4/hypotl.m4 (gl_FUNC_HYPOTL): Likewise.
+	* m4/iconv_open-utf.m4 (gl_FUNC_ICONV_OPEN_UTF_SUPPORT): Likewise.
+	* m4/log.m4 (gl_FUNC_LOG): Likewise.
+	* m4/log10.m4 (gl_FUNC_LOG10): Likewise.
+	* m4/log10f.m4 (gl_FUNC_LOG10F): Likewise.
+	* m4/log10l.m4 (gl_FUNC_LOG10L_WORKS): Likewise.
+	* m4/log1p.m4 (gl_FUNC_LOG1P): Likewise.
+	* m4/log1pf.m4 (gl_FUNC_LOG1PF): Likewise.
+	* m4/log1pl.m4 (gl_FUNC_LOG1PL, gl_FUNC_LOG1PL_WORKS): Likewise.
+	* m4/log2.m4 (gl_FUNC_LOG2): Likewise.
+	* m4/log2f.m4 (gl_FUNC_LOG2F): Likewise.
+	* m4/log2l.m4 (gl_FUNC_LOG2L_WORKS): Likewise.
+	* m4/logf.m4 (gl_FUNC_LOGF): Likewise.
+	* m4/logl.m4 (gl_FUNC_LOGL_WORKS): Likewise.
+	* m4/malloc.m4 (_AC_FUNC_MALLOC_IF): Likewise.
+	* m4/mkstemp.m4 (gl_FUNC_MKSTEMP): Likewise.
+	* m4/modf.m4 (gl_FUNC_MODF): Likewise.
+	* m4/modff.m4 (gl_FUNC_MODFF): Likewise.
+	* m4/modfl.m4 (gl_FUNC_MODFL): Likewise.
+	* m4/musl.m4 (gl_MUSL_LIBC): Likewise.
+	* m4/perror.m4 (gl_FUNC_PERROR): Likewise.
+	* m4/posix_spawn.m4 (gl_POSIX_SPAWN_SECURE,
+	gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDCLOSE,
+	gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDDUP2,
+	gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDOPEN): Likewise.
+	* m4/printf.m4 (gl_PRINTF_SIZES_C99, gl_PRINTF_INFINITE,
+	gl_PRINTF_INFINITE_LONG_DOUBLE, gl_PRINTF_DIRECTIVE_A,
+	gl_PRINTF_DIRECTIVE_F, gl_PRINTF_FLAG_ZERO, gl_SNPRINTF_TRUNCATION_C99,
+	gl_SNPRINTF_RETVAL_C99, gl_SNPRINTF_DIRECTIVE_N,
+	gl_VSNPRINTF_ZEROSIZE_C99): Likewise.
+	* m4/pthread_rwlock_rdlock.m4 (gl_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER):
+	Likewise.
+	* m4/putenv.m4 (gl_FUNC_PUTENV): Likewise.
+	* m4/realloc.m4 (_AC_FUNC_REALLOC_IF): Likewise.
+	* m4/remainder.m4 (gl_FUNC_REMAINDER): Likewise.
+	* m4/remainderf.m4 (gl_FUNC_REMAINDERF): Likewise.
+	* m4/remainderl.m4 (gl_FUNC_REMAINDERL, gl_FUNC_REMAINDERL_WORKS):
+	Likewise.
+	* m4/rintl.m4 (gl_FUNC_RINTL): Likewise.
+	* m4/round.m4 (gl_FUNC_ROUND): Likewise.
+	* m4/roundf.m4 (gl_FUNC_ROUNDF): Likewise.
+	* m4/roundl.m4 (gl_FUNC_ROUNDL): Likewise.
+	* m4/setenv.m4 (gl_FUNC_SETENV): Likewise.
+	* m4/setlocale_null.m4 (gl_FUNC_SETLOCALE_NULL): Likewise.
+	* m4/signbit.m4 (gl_SIGNBIT): Likewise.
+	* m4/stpncpy.m4 (gl_FUNC_STPNCPY): Likewise.
+	* m4/strerror.m4 (gl_FUNC_STRERROR, gl_FUNC_STRERROR_0): Likewise.
+	* m4/strtod.m4 (gl_FUNC_STRTOD): Likewise.
+	* m4/strtold.m4 (gl_FUNC_STRTOLD): Likewise.
+	* m4/trunc.m4 (gl_FUNC_TRUNC): Likewise.
+	* m4/truncf.m4 (gl_FUNC_TRUNCF): Likewise.
+	* m4/truncl.m4 (gl_FUNC_TRUNCL): Likewise.
+	* m4/ungetc.m4 (gl_FUNC_UNGETC_WORKS): Likewise.
+	* m4/wcwidth.m4 (gl_FUNC_WCWIDTH): Likewise.
+
 2023-02-13  ChuanGang Jiang  <jiangchuanganghw@outlook.com>  (tiny change)
 
 	hamt: Detect GCC version correctly.
diff --git a/m4/calloc.m4 b/m4/calloc.m4
index 23c0dd9f3f..3789cbffbf 100644
--- a/m4/calloc.m4
+++ b/m4/calloc.m4
@@ -1,4 +1,4 @@
-# calloc.m4 serial 29
+# calloc.m4 serial 30
 
 # Copyright (C) 2004-2023 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
@@ -36,14 +36,14 @@ AC_DEFUN([_AC_FUNC_CALLOC_IF],
          [ac_cv_func_calloc_0_nonnull=no])
      else
        case "$host_os" in
-                        # Guess yes on glibc systems.
-         *-gnu* | gnu*) ac_cv_func_calloc_0_nonnull="guessing yes" ;;
-                        # Guess yes on musl systems.
-         *-musl*)       ac_cv_func_calloc_0_nonnull="guessing yes" ;;
-                        # Guess yes on native Windows.
-         mingw*)        ac_cv_func_calloc_0_nonnull="guessing yes" ;;
-                        # If we don't know, obey --enable-cross-guesses.
-         *)             ac_cv_func_calloc_0_nonnull="$gl_cross_guess_normal" ;;
+                             # Guess yes on glibc systems.
+         *-gnu* | gnu*)      ac_cv_func_calloc_0_nonnull="guessing yes" ;;
+                             # Guess yes on musl systems.
+         *-musl* | midipix*) ac_cv_func_calloc_0_nonnull="guessing yes" ;;
+                             # Guess yes on native Windows.
+         mingw*)             ac_cv_func_calloc_0_nonnull="guessing yes" ;;
+                             # If we don't know, obey --enable-cross-guesses.
+         *)                  ac_cv_func_calloc_0_nonnull="$gl_cross_guess_normal" ;;
        esac
      fi
     ])
diff --git a/m4/cbrtl.m4 b/m4/cbrtl.m4
index 12b6ff6159..ff19b049b5 100644
--- a/m4/cbrtl.m4
+++ b/m4/cbrtl.m4
@@ -1,4 +1,4 @@
-# cbrtl.m4 serial 10
+# cbrtl.m4 serial 11
 dnl Copyright (C) 2012-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -72,14 +72,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_cbrtl_ieee=yes],
               [gl_cv_func_cbrtl_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_cbrtl_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_cbrtl_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_cbrtl_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_cbrtl_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_cbrtl_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_cbrtl_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_cbrtl_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_cbrtl_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/ceil.m4 b/m4/ceil.m4
index 7ce6648fd8..1e66c9ecd0 100644
--- a/m4/ceil.m4
+++ b/m4/ceil.m4
@@ -1,4 +1,4 @@
-# ceil.m4 serial 15
+# ceil.m4 serial 16
 dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -46,14 +46,14 @@ int main (int argc, char *argv[])
             [gl_cv_func_ceil_ieee=yes],
             [gl_cv_func_ceil_ieee=no],
             [case "$host_os" in
-                              # Guess yes on glibc systems.
-               *-gnu* | gnu*) gl_cv_func_ceil_ieee="guessing yes" ;;
-                              # Guess yes on musl systems.
-               *-musl*)       gl_cv_func_ceil_ieee="guessing yes" ;;
-                              # Guess yes on native Windows.
-               mingw*)        gl_cv_func_ceil_ieee="guessing yes" ;;
-                              # If we don't know, obey --enable-cross-guesses.
-               *)             gl_cv_func_ceil_ieee="$gl_cross_guess_normal" ;;
+                                   # Guess yes on glibc systems.
+               *-gnu* | gnu*)      gl_cv_func_ceil_ieee="guessing yes" ;;
+                                   # Guess yes on musl systems.
+               *-musl* | midipix*) gl_cv_func_ceil_ieee="guessing yes" ;;
+                                   # Guess yes on native Windows.
+               mingw*)             gl_cv_func_ceil_ieee="guessing yes" ;;
+                                   # If we don't know, obey --enable-cross-guesses.
+               *)                  gl_cv_func_ceil_ieee="$gl_cross_guess_normal" ;;
              esac
             ])
           LIBS="$save_LIBS"
diff --git a/m4/ceilf.m4 b/m4/ceilf.m4
index 6979ce86e8..8156c1d7e0 100644
--- a/m4/ceilf.m4
+++ b/m4/ceilf.m4
@@ -1,4 +1,4 @@
-# ceilf.m4 serial 19
+# ceilf.m4 serial 20
 dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -53,14 +53,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_ceilf_ieee=yes],
               [gl_cv_func_ceilf_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_ceilf_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_ceilf_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_ceilf_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_ceilf_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_ceilf_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_ceilf_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_ceilf_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_ceilf_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/ceill.m4 b/m4/ceill.m4
index 7f41b3abce..d7d708e28e 100644
--- a/m4/ceill.m4
+++ b/m4/ceill.m4
@@ -1,4 +1,4 @@
-# ceill.m4 serial 22
+# ceill.m4 serial 23
 dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -52,14 +52,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_ceill_ieee=yes],
               [gl_cv_func_ceill_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_ceill_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_ceill_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_ceill_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_ceill_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_ceill_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_ceill_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_ceill_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_ceill_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/exp2l.m4 b/m4/exp2l.m4
index abf9397a39..3d7d5d713a 100644
--- a/m4/exp2l.m4
+++ b/m4/exp2l.m4
@@ -1,4 +1,4 @@
-# exp2l.m4 serial 10
+# exp2l.m4 serial 11
 dnl Copyright (C) 2010-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -99,14 +99,14 @@ int main (int argc, char *argv[])
             [gl_cv_func_exp2l_works=yes],
             [gl_cv_func_exp2l_works=no],
             [case "$host_os" in
-                              # Guess yes on glibc systems.
-               *-gnu* | gnu*) gl_cv_func_exp2l_works="guessing yes" ;;
-                              # Guess yes on musl systems.
-               *-musl*)       gl_cv_func_exp2l_works="guessing yes" ;;
-                              # Guess yes on native Windows.
-               mingw*)        gl_cv_func_exp2l_works="guessing yes" ;;
-                              # If we don't know, obey --enable-cross-guesses.
-               *)             gl_cv_func_exp2l_works="$gl_cross_guess_normal" ;;
+                                   # Guess yes on glibc systems.
+               *-gnu* | gnu*)      gl_cv_func_exp2l_works="guessing yes" ;;
+                                   # Guess yes on musl systems.
+               *-musl* | midipix*) gl_cv_func_exp2l_works="guessing yes" ;;
+                                   # Guess yes on native Windows.
+               mingw*)             gl_cv_func_exp2l_works="guessing yes" ;;
+                                   # If we don't know, obey --enable-cross-guesses.
+               *)                  gl_cv_func_exp2l_works="$gl_cross_guess_normal" ;;
              esac
             ])
           LIBS="$save_LIBS"
@@ -154,14 +154,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_exp2l_ieee=yes],
               [gl_cv_func_exp2l_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_exp2l_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_exp2l_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_exp2l_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_exp2l_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_exp2l_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_exp2l_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_exp2l_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_exp2l_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/expl.m4 b/m4/expl.m4
index b5720798bb..842d5a5101 100644
--- a/m4/expl.m4
+++ b/m4/expl.m4
@@ -1,4 +1,4 @@
-# expl.m4 serial 18
+# expl.m4 serial 19
 dnl Copyright (C) 2010-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -148,14 +148,14 @@ int main (int argc, char *argv[])
             [gl_cv_func_expl_works=yes],
             [gl_cv_func_expl_works=no],
             [case "$host_os" in
-                              # Guess yes on glibc systems.
-               *-gnu* | gnu*) gl_cv_func_expl_works="guessing yes" ;;
-                              # Guess no on musl systems.
-               *-musl*)       gl_cv_func_expl_works="guessing no" ;;
-                              # Guess yes on native Windows.
-               mingw*)        gl_cv_func_expl_works="guessing yes" ;;
-                              # If we don't know, obey --enable-cross-guesses.
-               *)             gl_cv_func_expl_works="$gl_cross_guess_normal" ;;
+                                   # Guess yes on glibc systems.
+               *-gnu* | gnu*)      gl_cv_func_expl_works="guessing yes" ;;
+                                   # Guess no on musl systems.
+               *-musl* | midipix*) gl_cv_func_expl_works="guessing no" ;;
+                                   # Guess yes on native Windows.
+               mingw*)             gl_cv_func_expl_works="guessing yes" ;;
+                                   # If we don't know, obey --enable-cross-guesses.
+               *)                  gl_cv_func_expl_works="$gl_cross_guess_normal" ;;
              esac
             ])
           LIBS="$save_LIBS"
diff --git a/m4/expm1.m4 b/m4/expm1.m4
index 2a3e291c50..1a456e249d 100644
--- a/m4/expm1.m4
+++ b/m4/expm1.m4
@@ -1,4 +1,4 @@
-# expm1.m4 serial 9
+# expm1.m4 serial 10
 dnl Copyright (C) 2010-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -85,14 +85,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_expm1_ieee=yes],
               [gl_cv_func_expm1_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_expm1_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_expm1_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_expm1_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_expm1_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_expm1_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_expm1_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_expm1_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_expm1_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/expm1f.m4 b/m4/expm1f.m4
index 7072af81a7..183b0e9801 100644
--- a/m4/expm1f.m4
+++ b/m4/expm1f.m4
@@ -1,4 +1,4 @@
-# expm1f.m4 serial 4
+# expm1f.m4 serial 5
 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -77,16 +77,16 @@ int main (int argc, char *argv[])
               [gl_cv_func_expm1f_ieee=yes],
               [gl_cv_func_expm1f_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_expm1f_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_expm1f_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_expm1f_ieee="guessing yes" ;;
-                                # Guess no on AIX.
-                 aix*)          gl_cv_func_expm1f_ieee="guessing no" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_expm1f_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_expm1f_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_expm1f_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_expm1f_ieee="guessing yes" ;;
+                                     # Guess no on AIX.
+                 aix*)               gl_cv_func_expm1f_ieee="guessing no" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_expm1f_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/expm1l.m4 b/m4/expm1l.m4
index 62b9614583..78c7a3d579 100644
--- a/m4/expm1l.m4
+++ b/m4/expm1l.m4
@@ -1,4 +1,4 @@
-# expm1l.m4 serial 9
+# expm1l.m4 serial 10
 dnl Copyright (C) 2010-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -146,14 +146,14 @@ int main (int argc, char *argv[])
             [gl_cv_func_expm1l_works=yes],
             [gl_cv_func_expm1l_works=no],
             [case "$host_os" in
-                              # Guess yes on glibc systems.
-               *-gnu* | gnu*) gl_cv_func_expm1l_works="guessing yes" ;;
-                              # Guess no on musl systems.
-               *-musl*)       gl_cv_func_expm1l_works="guessing no" ;;
-                              # Guess yes on native Windows.
-               mingw*)        gl_cv_func_expm1l_works="guessing yes" ;;
-                              # If we don't know, obey --enable-cross-guesses.
-               *)             gl_cv_func_expm1l_works="$gl_cross_guess_normal" ;;
+                                   # Guess yes on glibc systems.
+               *-gnu* | gnu*)      gl_cv_func_expm1l_works="guessing yes" ;;
+                                   # Guess no on musl systems.
+               *-musl* | midipix*) gl_cv_func_expm1l_works="guessing no" ;;
+                                   # Guess yes on native Windows.
+               mingw*)             gl_cv_func_expm1l_works="guessing yes" ;;
+                                   # If we don't know, obey --enable-cross-guesses.
+               *)                  gl_cv_func_expm1l_works="$gl_cross_guess_normal" ;;
              esac
             ])
           LIBS="$save_LIBS"
diff --git a/m4/fclose.m4 b/m4/fclose.m4
index 9751b6d876..dc021dd9f3 100644
--- a/m4/fclose.m4
+++ b/m4/fclose.m4
@@ -1,4 +1,4 @@
-# fclose.m4 serial 9
+# fclose.m4 serial 10
 dnl Copyright (C) 2008-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -83,14 +83,14 @@ AC_DEFUN([gl_FUNC_FCLOSE_STDIN],
        [gl_cv_func_fclose_stdin=yes],
        [gl_cv_func_fclose_stdin=no],
        [case "$host_os" in
-                         # Guess no on glibc systems.
-          *-gnu* | gnu*) gl_cv_func_fclose_stdin="guessing no" ;;
-                         # Guess yes on musl systems.
-          *-musl*)       gl_cv_func_fclose_stdin="guessing yes" ;;
-                         # Guess no on native Windows.
-          mingw*)        gl_cv_func_fclose_stdin="guessing no" ;;
-                         # If we don't know, obey --enable-cross-guesses.
-          *)             gl_cv_func_fclose_stdin="$gl_cross_guess_normal" ;;
+                              # Guess no on glibc systems.
+          *-gnu* | gnu*)      gl_cv_func_fclose_stdin="guessing no" ;;
+                              # Guess yes on musl systems.
+          *-musl* | midipix*) gl_cv_func_fclose_stdin="guessing yes" ;;
+                              # Guess no on native Windows.
+          mingw*)             gl_cv_func_fclose_stdin="guessing no" ;;
+                              # If we don't know, obey --enable-cross-guesses.
+          *)                  gl_cv_func_fclose_stdin="$gl_cross_guess_normal" ;;
         esac
        ])
      rm conftest.txt
diff --git a/m4/fdopendir.m4 b/m4/fdopendir.m4
index 2c97539711..dfcc46c03e 100644
--- a/m4/fdopendir.m4
+++ b/m4/fdopendir.m4
@@ -1,4 +1,4 @@
-# serial 14
+# serial 15
 # See if we need to provide fdopendir.
 
 dnl Copyright (C) 2009-2023 Free Software Foundation, Inc.
@@ -49,12 +49,12 @@ DIR *fdopendir (int);
          [gl_cv_func_fdopendir_works=yes],
          [gl_cv_func_fdopendir_works=no],
          [case "$host_os" in
-                     # Guess yes on glibc systems.
-            *-gnu*)  gl_cv_func_fdopendir_works="guessing yes" ;;
-                     # Guess yes on musl systems.
-            *-musl*) gl_cv_func_fdopendir_works="guessing yes" ;;
-                     # If we don't know, obey --enable-cross-guesses.
-            *)       gl_cv_func_fdopendir_works="$gl_cross_guess_normal" ;;
+                                # Guess yes on glibc systems.
+            *-gnu*)             gl_cv_func_fdopendir_works="guessing yes" ;;
+                                # Guess yes on musl systems.
+            *-musl* | midipix*) gl_cv_func_fdopendir_works="guessing yes" ;;
+                                # If we don't know, obey --enable-cross-guesses.
+            *)                  gl_cv_func_fdopendir_works="$gl_cross_guess_normal" ;;
           esac
          ])])
     case "$gl_cv_func_fdopendir_works" in
diff --git a/m4/ffsll.m4 b/m4/ffsll.m4
index d2bffe6e81..0242dd9dad 100644
--- a/m4/ffsll.m4
+++ b/m4/ffsll.m4
@@ -1,4 +1,4 @@
-# ffsll.m4 serial 4
+# ffsll.m4 serial 5
 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -51,16 +51,16 @@ AC_DEFUN([gl_FUNC_FFSLL],
          [gl_cv_func_ffsll_works=yes],
          [gl_cv_func_ffsll_works=no],
          [case "$host_os" in
-                           # Guess yes on glibc systems.
-            *-gnu* | gnu*) gl_cv_func_ffsll_works="guessing yes" ;;
-                           # Guess yes on musl systems.
-            *-musl*)       gl_cv_func_ffsll_works="guessing yes" ;;
-                           # Guess yes on native Windows.
-            mingw*)        gl_cv_func_ffsll_works="guessing yes" ;;
-                           # Guess no on AIX.
-            aix*)          gl_cv_func_ffsll_works="guessing no" ;;
-                           # If we don't know, obey --enable-cross-guesses.
-            *)             gl_cv_func_ffsll_works="$gl_cross_guess_normal" ;;
+                                # Guess yes on glibc systems.
+            *-gnu* | gnu*)      gl_cv_func_ffsll_works="guessing yes" ;;
+                                # Guess yes on musl systems.
+            *-musl* | midipix*) gl_cv_func_ffsll_works="guessing yes" ;;
+                                # Guess yes on native Windows.
+            mingw*)             gl_cv_func_ffsll_works="guessing yes" ;;
+                                # Guess no on AIX.
+            aix*)               gl_cv_func_ffsll_works="guessing no" ;;
+                                # If we don't know, obey --enable-cross-guesses.
+            *)                  gl_cv_func_ffsll_works="$gl_cross_guess_normal" ;;
           esac
          ])
       ])
diff --git a/m4/floor.m4 b/m4/floor.m4
index 63e56d3956..ebab1e7bbe 100644
--- a/m4/floor.m4
+++ b/m4/floor.m4
@@ -1,4 +1,4 @@
-# floor.m4 serial 14
+# floor.m4 serial 15
 dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -42,14 +42,14 @@ int main (int argc, char *argv[])
             [gl_cv_func_floor_ieee=yes],
             [gl_cv_func_floor_ieee=no],
             [case "$host_os" in
-                              # Guess yes on glibc systems.
-               *-gnu* | gnu*) gl_cv_func_floor_ieee="guessing yes" ;;
-                              # Guess yes on musl systems.
-               *-musl*)       gl_cv_func_floor_ieee="guessing yes" ;;
-                              # Guess yes on native Windows.
-               mingw*)        gl_cv_func_floor_ieee="guessing yes" ;;
-                              # If we don't know, obey --enable-cross-guesses.
-               *)             gl_cv_func_floor_ieee="$gl_cross_guess_normal" ;;
+                                   # Guess yes on glibc systems.
+               *-gnu* | gnu*)      gl_cv_func_floor_ieee="guessing yes" ;;
+                                   # Guess yes on musl systems.
+               *-musl* | midipix*) gl_cv_func_floor_ieee="guessing yes" ;;
+                                   # Guess yes on native Windows.
+               mingw*)             gl_cv_func_floor_ieee="guessing yes" ;;
+                                   # If we don't know, obey --enable-cross-guesses.
+               *)                  gl_cv_func_floor_ieee="$gl_cross_guess_normal" ;;
              esac
             ])
           LIBS="$save_LIBS"
diff --git a/m4/floorf.m4 b/m4/floorf.m4
index c49ffa6bec..4ddb122de8 100644
--- a/m4/floorf.m4
+++ b/m4/floorf.m4
@@ -1,4 +1,4 @@
-# floorf.m4 serial 18
+# floorf.m4 serial 19
 dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -49,14 +49,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_floorf_ieee=yes],
               [gl_cv_func_floorf_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_floorf_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_floorf_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_floorf_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_floorf_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_floorf_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_floorf_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_floorf_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_floorf_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/fmod.m4 b/m4/fmod.m4
index 865374001f..fe7c8f41f8 100644
--- a/m4/fmod.m4
+++ b/m4/fmod.m4
@@ -1,4 +1,4 @@
-# fmod.m4 serial 9
+# fmod.m4 serial 10
 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -58,14 +58,14 @@ int main (int argc, char *argv[])
             [gl_cv_func_fmod_ieee=yes],
             [gl_cv_func_fmod_ieee=no],
             [case "$host_os" in
-                              # Guess yes on glibc systems.
-               *-gnu* | gnu*) gl_cv_func_fmod_ieee="guessing yes" ;;
-                              # Guess yes on musl systems.
-               *-musl*)       gl_cv_func_fmod_ieee="guessing yes" ;;
-                              # Guess yes on native Windows.
-               mingw*)        gl_cv_func_fmod_ieee="guessing yes" ;;
-                              # If we don't know, obey --enable-cross-guesses.
-               *)             gl_cv_func_fmod_ieee="$gl_cross_guess_normal" ;;
+                                   # Guess yes on glibc systems.
+               *-gnu* | gnu*)      gl_cv_func_fmod_ieee="guessing yes" ;;
+                                   # Guess yes on musl systems.
+               *-musl* | midipix*) gl_cv_func_fmod_ieee="guessing yes" ;;
+                                   # Guess yes on native Windows.
+               mingw*)             gl_cv_func_fmod_ieee="guessing yes" ;;
+                                   # If we don't know, obey --enable-cross-guesses.
+               *)                  gl_cv_func_fmod_ieee="$gl_cross_guess_normal" ;;
              esac
             ])
           LIBS="$save_LIBS"
diff --git a/m4/fmodf.m4 b/m4/fmodf.m4
index 2dd7fbfc7e..33ea15887d 100644
--- a/m4/fmodf.m4
+++ b/m4/fmodf.m4
@@ -1,4 +1,4 @@
-# fmodf.m4 serial 11
+# fmodf.m4 serial 12
 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -59,14 +59,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_fmodf_ieee=yes],
               [gl_cv_func_fmodf_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_fmodf_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_fmodf_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_fmodf_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_fmodf_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_fmodf_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_fmodf_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_fmodf_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_fmodf_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/fmodl.m4 b/m4/fmodl.m4
index 51fae629cf..0096de3bcb 100644
--- a/m4/fmodl.m4
+++ b/m4/fmodl.m4
@@ -1,4 +1,4 @@
-# fmodl.m4 serial 11
+# fmodl.m4 serial 12
 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -70,14 +70,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_fmodl_ieee=yes],
               [gl_cv_func_fmodl_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_fmodl_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_fmodl_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_fmodl_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_fmodl_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_fmodl_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_fmodl_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_fmodl_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_fmodl_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/fnmatch.m4 b/m4/fnmatch.m4
index e6f39f991f..895db13a2d 100644
--- a/m4/fnmatch.m4
+++ b/m4/fnmatch.m4
@@ -1,4 +1,4 @@
-# Check for fnmatch - serial 15.  -*- coding: utf-8 -*-
+# Check for fnmatch - serial 16.  -*- coding: utf-8 -*-
 
 # Copyright (C) 2000-2007, 2009-2023 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
@@ -119,10 +119,10 @@ AC_DEFUN([gl_FUNC_FNMATCH_POSIX],
          [eval "$gl_fnmatch_cache_var=yes"],
          [eval "$gl_fnmatch_cache_var=no"],
          [case "$host_os" in
-                     # Guess yes on musl systems.
-            *-musl*) eval "$gl_fnmatch_cache_var=\"guessing yes\"" ;;
-                     # Guess no otherwise, even on glibc systems.
-            *)       eval "$gl_fnmatch_cache_var=\"guessing no\"" ;;
+                                # Guess yes on musl systems.
+            *-musl* | midipix*) eval "$gl_fnmatch_cache_var=\"guessing yes\"" ;;
+                                # Guess no otherwise, even on glibc systems.
+            *)                  eval "$gl_fnmatch_cache_var=\"guessing no\"" ;;
           esac
          ])
       ])
diff --git a/m4/fopen.m4 b/m4/fopen.m4
index 9c39ff721b..6806394f8c 100644
--- a/m4/fopen.m4
+++ b/m4/fopen.m4
@@ -1,4 +1,4 @@
-# fopen.m4 serial 13
+# fopen.m4 serial 14
 dnl Copyright (C) 2007-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -87,7 +87,7 @@ int main ()
        [gl_cv_func_fopen_mode_x=no],
        [case "$host_os" in
           # Guess yes on glibc and musl systems.
-          linux*-gnu* | gnu* | kfreebsd*-gnu | *-musl*)
+          linux*-gnu* | gnu* | kfreebsd*-gnu | *-musl* | midipix*)
             gl_cv_func_fopen_mode_x="guessing yes" ;;
           # If we don't know, obey --enable-cross-guesses.
           *)
@@ -124,7 +124,7 @@ int main ()
        [gl_cv_func_fopen_mode_e=no],
        [case "$host_os" in
           # Guess yes on glibc and musl systems.
-          linux*-gnu* | gnu* | kfreebsd*-gnu | *-musl*)
+          linux*-gnu* | gnu* | kfreebsd*-gnu | *-musl* | midipix*)
             gl_cv_func_fopen_mode_e="guessing yes" ;;
           # Guess no on native Windows.
           mingw*)
diff --git a/m4/fpurge.m4 b/m4/fpurge.m4
index 8208250ee5..fe25596313 100644
--- a/m4/fpurge.m4
+++ b/m4/fpurge.m4
@@ -1,4 +1,4 @@
-# fpurge.m4 serial 13
+# fpurge.m4 serial 14
 dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -53,10 +53,10 @@ AC_DEFUN([gl_FUNC_FPURGE],
          [gl_cv_func_fpurge_works=yes],
          [gl_cv_func_fpurge_works=no],
          [case "$host_os" in
-                     # Guess yes on musl systems.
-            *-musl*) gl_cv_func_fpurge_works="guessing yes" ;;
-                     # Otherwise obey --enable-cross-guesses.
-            *)       gl_cv_func_fpurge_works="$gl_cross_guess_normal" ;;
+                                # Guess yes on musl systems.
+            *-musl* | midipix*) gl_cv_func_fpurge_works="guessing yes" ;;
+                                # Otherwise obey --enable-cross-guesses.
+            *)                  gl_cv_func_fpurge_works="$gl_cross_guess_normal" ;;
           esac
          ])
       ])
diff --git a/m4/getdelim.m4 b/m4/getdelim.m4
index d89aae5dff..60555b9718 100644
--- a/m4/getdelim.m4
+++ b/m4/getdelim.m4
@@ -1,4 +1,4 @@
-# getdelim.m4 serial 18
+# getdelim.m4 serial 19
 
 dnl Copyright (C) 2005-2007, 2009-2023 Free Software Foundation, Inc.
 dnl
@@ -82,8 +82,8 @@ AC_DEFUN([gl_FUNC_GETDELIM],
                 ],
                 [gl_cv_func_working_getdelim="guessing yes"],
                 [case "$host_os" in
-                   *-musl*) gl_cv_func_working_getdelim="guessing yes" ;;
-                   *)       gl_cv_func_working_getdelim="$gl_cross_guess_normal" ;;
+                   *-musl* | midipix*) gl_cv_func_working_getdelim="guessing yes" ;;
+                   *)                  gl_cv_func_working_getdelim="$gl_cross_guess_normal" ;;
                  esac
                 ])
              ])
diff --git a/m4/getline.m4 b/m4/getline.m4
index 1f2825c336..83e7e9315f 100644
--- a/m4/getline.m4
+++ b/m4/getline.m4
@@ -1,4 +1,4 @@
-# getline.m4 serial 32
+# getline.m4 serial 33
 
 dnl Copyright (C) 1998-2003, 2005-2007, 2009-2023 Free Software Foundation,
 dnl Inc.
@@ -76,8 +76,8 @@ AC_DEFUN([gl_FUNC_GETLINE],
             ],
             [am_cv_func_working_getline="guessing yes"],
             [case "$host_os" in
-               *-musl*) am_cv_func_working_getline="guessing yes" ;;
-               *)       am_cv_func_working_getline="$gl_cross_guess_normal" ;;
+               *-musl* | midipix*) am_cv_func_working_getline="guessing yes" ;;
+               *)                  am_cv_func_working_getline="$gl_cross_guess_normal" ;;
              esac
             ])
          ])
diff --git a/m4/hypot.m4 b/m4/hypot.m4
index c4ae9695ef..7a44195784 100644
--- a/m4/hypot.m4
+++ b/m4/hypot.m4
@@ -1,4 +1,4 @@
-# hypot.m4 serial 9
+# hypot.m4 serial 10
 dnl Copyright (C) 2012-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -55,14 +55,14 @@ int main (int argc, char *argv[])
             [gl_cv_func_hypot_ieee=yes],
             [gl_cv_func_hypot_ieee=no],
             [case "$host_os" in
-                              # Guess yes on glibc systems.
-               *-gnu* | gnu*) gl_cv_func_hypot_ieee="guessing yes" ;;
-                              # Guess yes on musl systems.
-               *-musl*)       gl_cv_func_hypot_ieee="guessing yes" ;;
-                              # Guess yes on native Windows.
-               mingw*)        gl_cv_func_hypot_ieee="guessing yes" ;;
-                              # If we don't know, obey --enable-cross-guesses.
-               *)             gl_cv_func_hypot_ieee="$gl_cross_guess_normal" ;;
+                                   # Guess yes on glibc systems.
+               *-gnu* | gnu*)      gl_cv_func_hypot_ieee="guessing yes" ;;
+                                   # Guess yes on musl systems.
+               *-musl* | midipix*) gl_cv_func_hypot_ieee="guessing yes" ;;
+                                   # Guess yes on native Windows.
+               mingw*)             gl_cv_func_hypot_ieee="guessing yes" ;;
+                                   # If we don't know, obey --enable-cross-guesses.
+               *)                  gl_cv_func_hypot_ieee="$gl_cross_guess_normal" ;;
              esac
             ])
           LIBS="$save_LIBS"
diff --git a/m4/hypotf.m4 b/m4/hypotf.m4
index 519ca5cebf..4817a96522 100644
--- a/m4/hypotf.m4
+++ b/m4/hypotf.m4
@@ -1,4 +1,4 @@
-# hypotf.m4 serial 10
+# hypotf.m4 serial 11
 dnl Copyright (C) 2012-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -71,14 +71,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_hypotf_ieee=yes],
               [gl_cv_func_hypotf_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_hypotf_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_hypotf_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_hypotf_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_hypotf_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_hypotf_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_hypotf_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_hypotf_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_hypotf_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/hypotl.m4 b/m4/hypotl.m4
index e9291dd2b8..209bf5ccb1 100644
--- a/m4/hypotl.m4
+++ b/m4/hypotl.m4
@@ -1,4 +1,4 @@
-# hypotl.m4 serial 11
+# hypotl.m4 serial 12
 dnl Copyright (C) 2012-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -71,14 +71,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_hypotl_ieee=yes],
               [gl_cv_func_hypotl_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_hypotl_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_hypotl_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_hypotl_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_hypotl_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_hypotl_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_hypotl_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_hypotl_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_hypotl_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/iconv_open-utf.m4 b/m4/iconv_open-utf.m4
index 8f974bb85d..81fc393b22 100644
--- a/m4/iconv_open-utf.m4
+++ b/m4/iconv_open-utf.m4
@@ -1,4 +1,4 @@
-# iconv_open-utf.m4 serial 4
+# iconv_open-utf.m4 serial 5
 dnl Copyright (C) 2007-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -220,9 +220,8 @@ int main ()
            else
 changequote(,)dnl
              case "$host_os" in
-               *-musl*) gl_cv_func_iconv_supports_utf="guessing yes" ;;
-               solaris2.9 | solaris2.1[0-9])
-                        gl_cv_func_iconv_supports_utf="guessing yes" ;;
+               *-musl* | midipix*)           gl_cv_func_iconv_supports_utf="guessing yes" ;;
+               solaris2.9 | solaris2.1[0-9]) gl_cv_func_iconv_supports_utf="guessing yes" ;;
              esac
 changequote([,])dnl
            fi
diff --git a/m4/log.m4 b/m4/log.m4
index 3cffe6b7ca..a0fcc3e465 100644
--- a/m4/log.m4
+++ b/m4/log.m4
@@ -1,4 +1,4 @@
-# log.m4 serial 11
+# log.m4 serial 12
 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -58,14 +58,14 @@ int main (int argc, char *argv[])
             [gl_cv_func_log_ieee=yes],
             [gl_cv_func_log_ieee=no],
             [case "$host_os" in
-                              # Guess yes on glibc systems.
-               *-gnu* | gnu*) gl_cv_func_log_ieee="guessing yes" ;;
-                              # Guess yes on musl systems.
-               *-musl*)       gl_cv_func_log_ieee="guessing yes" ;;
-                              # Guess yes on native Windows.
-               mingw*)        gl_cv_func_log_ieee="guessing yes" ;;
-                              # If we don't know, obey --enable-cross-guesses.
-               *)             gl_cv_func_log_ieee="$gl_cross_guess_normal" ;;
+                                   # Guess yes on glibc systems.
+               *-gnu* | gnu*)      gl_cv_func_log_ieee="guessing yes" ;;
+                                   # Guess yes on musl systems.
+               *-musl* | midipix*) gl_cv_func_log_ieee="guessing yes" ;;
+                                   # Guess yes on native Windows.
+               mingw*)             gl_cv_func_log_ieee="guessing yes" ;;
+                                   # If we don't know, obey --enable-cross-guesses.
+               *)                  gl_cv_func_log_ieee="$gl_cross_guess_normal" ;;
              esac
             ])
           LIBS="$save_LIBS"
diff --git a/m4/log10.m4 b/m4/log10.m4
index 2e79912ea2..e803a8e6b3 100644
--- a/m4/log10.m4
+++ b/m4/log10.m4
@@ -1,4 +1,4 @@
-# log10.m4 serial 11
+# log10.m4 serial 12
 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -58,14 +58,14 @@ int main (int argc, char *argv[])
             [gl_cv_func_log10_ieee=yes],
             [gl_cv_func_log10_ieee=no],
             [case "$host_os" in
-                              # Guess yes on glibc systems.
-               *-gnu* | gnu*) gl_cv_func_log10_ieee="guessing yes" ;;
-                              # Guess yes on musl systems.
-               *-musl*)       gl_cv_func_log10_ieee="guessing yes" ;;
-                              # Guess yes on native Windows.
-               mingw*)        gl_cv_func_log10_ieee="guessing yes" ;;
-                              # If we don't know, obey --enable-cross-guesses.
-               *)             gl_cv_func_log10_ieee="$gl_cross_guess_normal" ;;
+                                   # Guess yes on glibc systems.
+               *-gnu* | gnu*)      gl_cv_func_log10_ieee="guessing yes" ;;
+                                   # Guess yes on musl systems.
+               *-musl* | midipix*) gl_cv_func_log10_ieee="guessing yes" ;;
+                                   # Guess yes on native Windows.
+               mingw*)             gl_cv_func_log10_ieee="guessing yes" ;;
+                                   # If we don't know, obey --enable-cross-guesses.
+               *)                  gl_cv_func_log10_ieee="$gl_cross_guess_normal" ;;
              esac
             ])
           LIBS="$save_LIBS"
diff --git a/m4/log10f.m4 b/m4/log10f.m4
index e5f952ccf3..4d44c71dc6 100644
--- a/m4/log10f.m4
+++ b/m4/log10f.m4
@@ -1,4 +1,4 @@
-# log10f.m4 serial 12
+# log10f.m4 serial 13
 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -68,14 +68,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_log10f_ieee=yes],
               [gl_cv_func_log10f_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_log10f_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_log10f_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_log10f_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_log10f_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_log10f_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_log10f_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_log10f_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_log10f_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/log10l.m4 b/m4/log10l.m4
index f67d89bfaf..319c461a5d 100644
--- a/m4/log10l.m4
+++ b/m4/log10l.m4
@@ -1,4 +1,4 @@
-# log10l.m4 serial 10
+# log10l.m4 serial 11
 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -145,14 +145,14 @@ int main (int argc, char *argv[])
         [gl_cv_func_log10l_works=yes],
         [gl_cv_func_log10l_works=no],
         [case "$host_os" in
-                          # Guess yes on glibc systems.
-           *-gnu* | gnu*) gl_cv_func_log10l_works="guessing yes" ;;
-                          # Guess no on musl systems.
-           *-musl*)       gl_cv_func_log10l_works="guessing no" ;;
-                          # Guess yes on native Windows.
-           mingw*)        gl_cv_func_log10l_works="guessing yes" ;;
-                          # If we don't know, obey --enable-cross-guesses.
-           *)             gl_cv_func_log10l_works="$gl_cross_guess_normal" ;;
+                               # Guess yes on glibc systems.
+           *-gnu* | gnu*)      gl_cv_func_log10l_works="guessing yes" ;;
+                               # Guess no on musl systems.
+           *-musl* | midipix*) gl_cv_func_log10l_works="guessing no" ;;
+                               # Guess yes on native Windows.
+           mingw*)             gl_cv_func_log10l_works="guessing yes" ;;
+                               # If we don't know, obey --enable-cross-guesses.
+           *)                  gl_cv_func_log10l_works="$gl_cross_guess_normal" ;;
          esac
         ])
     ])
diff --git a/m4/log1p.m4 b/m4/log1p.m4
index 56b11af0f0..9e06540950 100644
--- a/m4/log1p.m4
+++ b/m4/log1p.m4
@@ -1,4 +1,4 @@
-# log1p.m4 serial 8
+# log1p.m4 serial 9
 dnl Copyright (C) 2012-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -52,14 +52,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_log1p_ieee=yes],
               [gl_cv_func_log1p_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_log1p_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_log1p_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_log1p_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_log1p_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_log1p_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_log1p_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_log1p_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_log1p_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/log1pf.m4 b/m4/log1pf.m4
index 6a950a086a..0cb6c7391f 100644
--- a/m4/log1pf.m4
+++ b/m4/log1pf.m4
@@ -1,4 +1,4 @@
-# log1pf.m4 serial 8
+# log1pf.m4 serial 9
 dnl Copyright (C) 2012-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -61,14 +61,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_log1pf_ieee=yes],
               [gl_cv_func_log1pf_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_log1pf_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_log1pf_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_log1pf_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_log1pf_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_log1pf_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_log1pf_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_log1pf_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_log1pf_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/log1pl.m4 b/m4/log1pl.m4
index 280e629d89..3519ce8e38 100644
--- a/m4/log1pl.m4
+++ b/m4/log1pl.m4
@@ -1,4 +1,4 @@
-# log1pl.m4 serial 9
+# log1pl.m4 serial 10
 dnl Copyright (C) 2012-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -62,14 +62,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_log1pl_ieee=yes],
               [gl_cv_func_log1pl_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_log1pl_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_log1pl_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_log1pl_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_log1pl_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_log1pl_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_log1pl_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_log1pl_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_log1pl_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
@@ -187,14 +187,14 @@ int main (int argc, char *argv[])
         [gl_cv_func_log1pl_works=yes],
         [gl_cv_func_log1pl_works=no],
         [case "$host_os" in
-                          # Guess yes on glibc systems.
-           *-gnu* | gnu*) gl_cv_func_log1pl_works="guessing yes" ;;
-                          # Guess no on musl systems.
-           *-musl*)       gl_cv_func_log1pl_works="guessing no" ;;
-                          # Guess yes on native Windows.
-           mingw*)        gl_cv_func_log1pl_works="guessing yes" ;;
-                          # If we don't know, obey --enable-cross-guesses.
-           *)             gl_cv_func_log1pl_works="$gl_cross_guess_normal" ;;
+                               # Guess yes on glibc systems.
+           *-gnu* | gnu*)      gl_cv_func_log1pl_works="guessing yes" ;;
+                               # Guess no on musl systems.
+           *-musl* | midipix*) gl_cv_func_log1pl_works="guessing no" ;;
+                               # Guess yes on native Windows.
+           mingw*)             gl_cv_func_log1pl_works="guessing yes" ;;
+                               # If we don't know, obey --enable-cross-guesses.
+           *)                  gl_cv_func_log1pl_works="$gl_cross_guess_normal" ;;
          esac
         ])
     ])
diff --git a/m4/log2.m4 b/m4/log2.m4
index 809853ed3b..86e39a237c 100644
--- a/m4/log2.m4
+++ b/m4/log2.m4
@@ -1,4 +1,4 @@
-# log2.m4 serial 12
+# log2.m4 serial 13
 dnl Copyright (C) 2010-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -79,14 +79,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_log2_ieee=yes],
               [gl_cv_func_log2_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_log2_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_log2_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_log2_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_log2_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_log2_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_log2_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_log2_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_log2_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/log2f.m4 b/m4/log2f.m4
index 3c47f1aa87..112cd8fcb9 100644
--- a/m4/log2f.m4
+++ b/m4/log2f.m4
@@ -1,4 +1,4 @@
-# log2f.m4 serial 12
+# log2f.m4 serial 13
 dnl Copyright (C) 2010-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -80,14 +80,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_log2f_ieee=yes],
               [gl_cv_func_log2f_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_log2f_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_log2f_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_log2f_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_log2f_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_log2f_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_log2f_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_log2f_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_log2f_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/log2l.m4 b/m4/log2l.m4
index 57639a2af5..5fede3f067 100644
--- a/m4/log2l.m4
+++ b/m4/log2l.m4
@@ -1,4 +1,4 @@
-# log2l.m4 serial 5
+# log2l.m4 serial 6
 dnl Copyright (C) 2010-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -165,16 +165,16 @@ int main (int argc, char *argv[])
         [gl_cv_func_log2l_works=yes],
         [gl_cv_func_log2l_works=no],
         [case "$host_os" in
-                          # Guess yes on glibc systems.
-           *-gnu* | gnu*) gl_cv_func_log2l_works="guessing yes" ;;
-                          # Guess no on musl systems.
-           *-musl*)       gl_cv_func_log2l_works="guessing no" ;;
-                          # Guess no on OSF/1.
-           osf*)          gl_cv_func_log2l_works="guessing no" ;;
-                          # Guess yes on native Windows.
-           mingw*)        gl_cv_func_log2l_works="guessing yes" ;;
-                          # If we don't know, obey --enable-cross-guesses.
-           *)             gl_cv_func_log2l_works="$gl_cross_guess_normal" ;;
+                               # Guess yes on glibc systems.
+           *-gnu* | gnu*)      gl_cv_func_log2l_works="guessing yes" ;;
+                               # Guess no on musl systems.
+           *-musl* | midipix*) gl_cv_func_log2l_works="guessing no" ;;
+                               # Guess no on OSF/1.
+           osf*)               gl_cv_func_log2l_works="guessing no" ;;
+                               # Guess yes on native Windows.
+           mingw*)             gl_cv_func_log2l_works="guessing yes" ;;
+                               # If we don't know, obey --enable-cross-guesses.
+           *)                  gl_cv_func_log2l_works="$gl_cross_guess_normal" ;;
          esac
         ])
     ])
diff --git a/m4/logf.m4 b/m4/logf.m4
index 2c546779a4..d9fe5fdc71 100644
--- a/m4/logf.m4
+++ b/m4/logf.m4
@@ -1,4 +1,4 @@
-# logf.m4 serial 12
+# logf.m4 serial 13
 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -68,14 +68,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_logf_ieee=yes],
               [gl_cv_func_logf_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_logf_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_logf_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_logf_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_logf_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_logf_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_logf_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_logf_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_logf_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/logl.m4 b/m4/logl.m4
index 316b24d161..cc50f4d4d1 100644
--- a/m4/logl.m4
+++ b/m4/logl.m4
@@ -1,4 +1,4 @@
-# logl.m4 serial 15
+# logl.m4 serial 16
 dnl Copyright (C) 2010-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -186,14 +186,14 @@ int main (int argc, char *argv[])
         [gl_cv_func_logl_works=yes],
         [gl_cv_func_logl_works=no],
         [case "$host_os" in
-                          # Guess yes on glibc systems.
-           *-gnu* | gnu*) gl_cv_func_logl_works="guessing yes" ;;
-                          # Guess no on musl systems.
-           *-musl*)       gl_cv_func_logl_works="guessing no" ;;
-                          # Guess yes on native Windows.
-           mingw*)        gl_cv_func_logl_works="guessing yes" ;;
-                          # If we don't know, obey --enable-cross-guesses.
-           *)             gl_cv_func_logl_works="$gl_cross_guess_normal" ;;
+                               # Guess yes on glibc systems.
+           *-gnu* | gnu*)      gl_cv_func_logl_works="guessing yes" ;;
+                               # Guess no on musl systems.
+           *-musl* | midipix*) gl_cv_func_logl_works="guessing no" ;;
+                               # Guess yes on native Windows.
+           mingw*)             gl_cv_func_logl_works="guessing yes" ;;
+                               # If we don't know, obey --enable-cross-guesses.
+           *)                  gl_cv_func_logl_works="$gl_cross_guess_normal" ;;
          esac
         ])
     ])
diff --git a/m4/malloc.m4 b/m4/malloc.m4
index 554029243d..bc580176f5 100644
--- a/m4/malloc.m4
+++ b/m4/malloc.m4
@@ -1,4 +1,4 @@
-# malloc.m4 serial 28
+# malloc.m4 serial 29
 dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -25,7 +25,7 @@ AC_DEFUN([_AC_FUNC_MALLOC_IF],
        [case "$host_os" in
           # Guess yes on platforms where we know the result.
           *-gnu* | freebsd* | netbsd* | openbsd* | bitrig* \
-          | gnu* | *-musl* | midnightbsd* \
+          | gnu* | *-musl* | midipix* | midnightbsd* \
           | hpux* | solaris* | cygwin* | mingw* | msys* )
             ac_cv_func_malloc_0_nonnull="guessing yes" ;;
           # If we don't know, obey --enable-cross-guesses.
diff --git a/m4/mkstemp.m4 b/m4/mkstemp.m4
index 4a64045fea..d4a15ead33 100644
--- a/m4/mkstemp.m4
+++ b/m4/mkstemp.m4
@@ -1,4 +1,4 @@
-#serial 28
+#serial 29
 
 # Copyright (C) 2001, 2003-2007, 2009-2023 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
@@ -58,14 +58,14 @@ AC_DEFUN([gl_FUNC_MKSTEMP],
           [gl_cv_func_working_mkstemp=yes],
           [gl_cv_func_working_mkstemp=no],
           [case "$host_os" in
-                            # Guess yes on glibc systems.
-             *-gnu* | gnu*) gl_cv_func_working_mkstemp="guessing yes" ;;
-                            # Guess yes on musl systems.
-             *-musl*)       gl_cv_func_working_mkstemp="guessing yes" ;;
-                            # Guess no on native Windows.
-             mingw*)        gl_cv_func_working_mkstemp="guessing no" ;;
-                            # If we don't know, obey --enable-cross-guesses.
-             *)             gl_cv_func_working_mkstemp="$gl_cross_guess_normal" ;;
+                                 # Guess yes on glibc systems.
+             *-gnu* | gnu*)      gl_cv_func_working_mkstemp="guessing yes" ;;
+                                 # Guess yes on musl systems.
+             *-musl* | midipix*) gl_cv_func_working_mkstemp="guessing yes" ;;
+                                 # Guess no on native Windows.
+             mingw*)             gl_cv_func_working_mkstemp="guessing no" ;;
+                                 # If we don't know, obey --enable-cross-guesses.
+             *)                  gl_cv_func_working_mkstemp="$gl_cross_guess_normal" ;;
            esac
           ])
         rm -rf conftest.mkstemp
diff --git a/m4/modf.m4 b/m4/modf.m4
index f136ae5ffe..90671d1370 100644
--- a/m4/modf.m4
+++ b/m4/modf.m4
@@ -1,4 +1,4 @@
-# modf.m4 serial 9
+# modf.m4 serial 10
 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -61,21 +61,21 @@ int main (int argc, char *argv[])
             [gl_cv_func_modf_ieee=yes],
             [gl_cv_func_modf_ieee=no],
             [case "$host_os" in
-                              # Guess yes on glibc systems.
-               *-gnu* | gnu*) gl_cv_func_modf_ieee="guessing yes" ;;
-                              # Guess yes on musl systems.
-               *-musl*)       gl_cv_func_modf_ieee="guessing yes" ;;
-                              # Guess yes on MSVC, no on mingw.
-               mingw*)        AC_EGREP_CPP([Known], [
+                                   # Guess yes on glibc systems.
+               *-gnu* | gnu*)      gl_cv_func_modf_ieee="guessing yes" ;;
+                                   # Guess yes on musl systems.
+               *-musl* | midipix*) gl_cv_func_modf_ieee="guessing yes" ;;
+                                   # Guess yes on MSVC, no on mingw.
+               mingw*)             AC_EGREP_CPP([Known], [
 #ifdef _MSC_VER
  Known
 #endif
-                                ],
-                                [gl_cv_func_modf_ieee="guessing yes"],
-                                [gl_cv_func_modf_ieee="guessing no"])
-                              ;;
-                              # If we don't know, obey --enable-cross-guesses.
-               *)             gl_cv_func_modf_ieee="$gl_cross_guess_normal" ;;
+                                     ],
+                                     [gl_cv_func_modf_ieee="guessing yes"],
+                                     [gl_cv_func_modf_ieee="guessing no"])
+                                   ;;
+                                   # If we don't know, obey --enable-cross-guesses.
+               *)                  gl_cv_func_modf_ieee="$gl_cross_guess_normal" ;;
              esac
             ])
           LIBS="$save_LIBS"
diff --git a/m4/modff.m4 b/m4/modff.m4
index fcf07bee9e..555bf46634 100644
--- a/m4/modff.m4
+++ b/m4/modff.m4
@@ -1,4 +1,4 @@
-# modff.m4 serial 11
+# modff.m4 serial 12
 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -69,21 +69,21 @@ int main (int argc, char *argv[])
               [gl_cv_func_modff_ieee=yes],
               [gl_cv_func_modff_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_modff_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_modff_ieee="guessing yes" ;;
-                                # Guess yes on MSVC, no on mingw.
-                 mingw*)        AC_EGREP_CPP([Known], [
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_modff_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_modff_ieee="guessing yes" ;;
+                                     # Guess yes on MSVC, no on mingw.
+                 mingw*)             AC_EGREP_CPP([Known], [
 #ifdef _MSC_VER
  Known
 #endif
-                                  ],
-                                  [gl_cv_func_modff_ieee="guessing yes"],
-                                  [gl_cv_func_modff_ieee="guessing no"])
-                                ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_modff_ieee="$gl_cross_guess_normal" ;;
+                                       ],
+                                       [gl_cv_func_modff_ieee="guessing yes"],
+                                       [gl_cv_func_modff_ieee="guessing no"])
+                                     ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_modff_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/modfl.m4 b/m4/modfl.m4
index 6fe9d0183e..46f55bd911 100644
--- a/m4/modfl.m4
+++ b/m4/modfl.m4
@@ -1,4 +1,4 @@
-# modfl.m4 serial 8
+# modfl.m4 serial 9
 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -63,21 +63,21 @@ int main (int argc, char *argv[])
               [gl_cv_func_modfl_ieee=yes],
               [gl_cv_func_modfl_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_modfl_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_modfl_ieee="guessing yes" ;;
-                                # Guess yes on MSVC, no on mingw.
-                 mingw*)        AC_EGREP_CPP([Known], [
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_modfl_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_modfl_ieee="guessing yes" ;;
+                                     # Guess yes on MSVC, no on mingw.
+                 mingw*)             AC_EGREP_CPP([Known], [
 #ifdef _MSC_VER
  Known
 #endif
-                                  ],
-                                  [gl_cv_func_modfl_ieee="guessing yes"],
-                                  [gl_cv_func_modfl_ieee="guessing no"])
-                                ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_modfl_ieee="$gl_cross_guess_normal" ;;
+                                       ],
+                                       [gl_cv_func_modfl_ieee="guessing yes"],
+                                       [gl_cv_func_modfl_ieee="guessing no"])
+                                     ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_modfl_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/musl.m4 b/m4/musl.m4
index 73898f6934..e28a3fed67 100644
--- a/m4/musl.m4
+++ b/m4/musl.m4
@@ -1,4 +1,4 @@
-# musl.m4 serial 3
+# musl.m4 serial 4
 dnl Copyright (C) 2019-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -13,6 +13,8 @@ AC_DEFUN_ONCE([gl_MUSL_LIBC],
 [
   AC_REQUIRE([AC_CANONICAL_HOST])
   case "$host_os" in
-    *-musl*) AC_DEFINE([MUSL_LIBC], [1], [Define to 1 on musl libc.]) ;;
+    *-musl* | midipix*)
+      AC_DEFINE([MUSL_LIBC], [1], [Define to 1 on musl libc.])
+      ;;
   esac
 ])
diff --git a/m4/perror.m4 b/m4/perror.m4
index 2545cb3487..9842b24c8e 100644
--- a/m4/perror.m4
+++ b/m4/perror.m4
@@ -1,4 +1,4 @@
-# perror.m4 serial 11
+# perror.m4 serial 12
 dnl Copyright (C) 2008-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -48,12 +48,12 @@ AC_DEFUN([gl_FUNC_PERROR],
             rm -rf conftest.txt1 conftest.txt2],
            [gl_cv_func_perror_works=no],
            [case "$host_os" in
-                       # Guess yes on musl systems.
-              *-musl*) gl_cv_func_perror_works="guessing yes" ;;
-                       # Guess yes on native Windows.
-              mingw*)  gl_cv_func_perror_works="guessing yes" ;;
-                       # Otherwise obey --enable-cross-guesses.
-              *)       gl_cv_func_perror_works="$gl_cross_guess_normal" ;;
+                                  # Guess yes on musl systems.
+              *-musl* | midipix*) gl_cv_func_perror_works="guessing yes" ;;
+                                  # Guess yes on native Windows.
+              mingw*)             gl_cv_func_perror_works="guessing yes" ;;
+                                  # Otherwise obey --enable-cross-guesses.
+              *)                  gl_cv_func_perror_works="$gl_cross_guess_normal" ;;
             esac
            ])
         ])
diff --git a/m4/posix_spawn.m4 b/m4/posix_spawn.m4
index de0bd00c2a..0a0dfe7685 100644
--- a/m4/posix_spawn.m4
+++ b/m4/posix_spawn.m4
@@ -1,4 +1,4 @@
-# posix_spawn.m4 serial 22
+# posix_spawn.m4 serial 23
 dnl Copyright (C) 2008-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -534,7 +534,7 @@ AC_DEFUN([gl_POSIX_SPAWN_SECURE],
        [case "$host_os" in
           # Guess yes on glibc systems (glibc >= 2.15 actually) except GNU/Hurd,
           # musl libc, NetBSD.
-          *-gnu* | *-musl* | netbsd*)
+          *-gnu* | *-musl* | midipix* | netbsd*)
             gl_cv_func_posix_spawnp_secure_exec="guessing yes" ;;
           # Guess no on GNU/Hurd, macOS, FreeBSD, OpenBSD, AIX, Solaris, Cygwin.
           gnu* | darwin* | freebsd* | dragonfly* | midnightbsd* | openbsd* | \
@@ -585,11 +585,11 @@ int main ()
          [gl_cv_func_posix_spawn_file_actions_addclose_works=no],
          [# Guess no on musl libc and Solaris, yes otherwise.
           case "$host_os" in
-            *-musl*)  gl_cv_func_posix_spawn_file_actions_addclose_works="guessing no" ;;
-            solaris*) gl_cv_func_posix_spawn_file_actions_addclose_works="guessing no" ;;
-                      # Guess no on native Windows.
-            mingw*)   gl_cv_func_posix_spawn_file_actions_addclose_works="guessing no" ;;
-            *)        gl_cv_func_posix_spawn_file_actions_addclose_works="guessing yes" ;;
+            *-musl* | midipix*) gl_cv_func_posix_spawn_file_actions_addclose_works="guessing no" ;;
+            solaris*)           gl_cv_func_posix_spawn_file_actions_addclose_works="guessing no" ;;
+                                # Guess no on native Windows.
+            mingw*)             gl_cv_func_posix_spawn_file_actions_addclose_works="guessing no" ;;
+            *)                  gl_cv_func_posix_spawn_file_actions_addclose_works="guessing yes" ;;
           esac
          ])
       ])
@@ -629,11 +629,11 @@ int main ()
          [gl_cv_func_posix_spawn_file_actions_adddup2_works=no],
          [# Guess no on musl libc and Solaris, yes otherwise.
           case "$host_os" in
-            *-musl*)  gl_cv_func_posix_spawn_file_actions_adddup2_works="guessing no";;
-            solaris*) gl_cv_func_posix_spawn_file_actions_adddup2_works="guessing no";;
-                      # Guess no on native Windows.
-            mingw*)   gl_cv_func_posix_spawn_file_actions_adddup2_works="guessing no" ;;
-            *)        gl_cv_func_posix_spawn_file_actions_adddup2_works="guessing yes";;
+            *-musl* | midipix*) gl_cv_func_posix_spawn_file_actions_adddup2_works="guessing no";;
+            solaris*)           gl_cv_func_posix_spawn_file_actions_adddup2_works="guessing no";;
+                                # Guess no on native Windows.
+            mingw*)             gl_cv_func_posix_spawn_file_actions_adddup2_works="guessing no" ;;
+            *)                  gl_cv_func_posix_spawn_file_actions_adddup2_works="guessing yes";;
           esac
          ])
       ])
@@ -675,11 +675,11 @@ int main ()
          [gl_cv_func_posix_spawn_file_actions_addopen_works=no],
          [# Guess no on musl libc and Solaris, yes otherwise.
           case "$host_os" in
-            *-musl*)  gl_cv_func_posix_spawn_file_actions_addopen_works="guessing no";;
-            solaris*) gl_cv_func_posix_spawn_file_actions_addopen_works="guessing no";;
-                      # Guess no on native Windows.
-            mingw*)   gl_cv_func_posix_spawn_file_actions_addopen_works="guessing no" ;;
-            *)        gl_cv_func_posix_spawn_file_actions_addopen_works="guessing yes";;
+            *-musl* | midipix*) gl_cv_func_posix_spawn_file_actions_addopen_works="guessing no";;
+            solaris*)           gl_cv_func_posix_spawn_file_actions_addopen_works="guessing no";;
+                                # Guess no on native Windows.
+            mingw*)             gl_cv_func_posix_spawn_file_actions_addopen_works="guessing no" ;;
+            *)                  gl_cv_func_posix_spawn_file_actions_addopen_works="guessing yes";;
           esac
          ])
       ])
diff --git a/m4/printf.m4 b/m4/printf.m4
index 4e65abc6e6..de98a870e9 100644
--- a/m4/printf.m4
+++ b/m4/printf.m4
@@ -1,4 +1,4 @@
-# printf.m4 serial 73
+# printf.m4 serial 74
 dnl Copyright (C) 2003, 2007-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -63,7 +63,7 @@ changequote(,)dnl
                                  # Guess yes on glibc systems.
            *-gnu* | gnu*)        gl_cv_func_printf_sizes_c99="guessing yes";;
                                  # Guess yes on musl systems.
-           *-musl*)              gl_cv_func_printf_sizes_c99="guessing yes";;
+           *-musl* | midipix*)   gl_cv_func_printf_sizes_c99="guessing yes";;
                                  # Guess yes on FreeBSD >= 5.
            freebsd[1-4].*)       gl_cv_func_printf_sizes_c99="guessing no";;
            freebsd* | kfreebsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
@@ -244,7 +244,7 @@ changequote(,)dnl
                                  # Guess yes on glibc systems.
            *-gnu* | gnu*)        gl_cv_func_printf_infinite="guessing yes";;
                                  # Guess yes on musl systems.
-           *-musl*)              gl_cv_func_printf_infinite="guessing yes";;
+           *-musl* | midipix*)   gl_cv_func_printf_infinite="guessing yes";;
                                  # Guess yes on FreeBSD >= 6.
            freebsd[1-5].*)       gl_cv_func_printf_infinite="guessing no";;
            freebsd* | kfreebsd*) gl_cv_func_printf_infinite="guessing yes";;
@@ -467,7 +467,7 @@ changequote(,)dnl
                                          # Guess yes on glibc systems.
                    *-gnu* | gnu*)        gl_cv_func_printf_infinite_long_double="guessing yes";;
                                          # Guess yes on musl systems.
-                   *-musl*)              gl_cv_func_printf_infinite_long_double="guessing yes";;
+                   *-musl* | midipix*)   gl_cv_func_printf_infinite_long_double="guessing yes";;
                                          # Guess yes on FreeBSD >= 6.
                    freebsd[1-5].*)       gl_cv_func_printf_infinite_long_double="guessing no";;
                    freebsd* | kfreebsd*) gl_cv_func_printf_infinite_long_double="guessing yes";;
@@ -591,7 +591,7 @@ int main ()
                [gl_cv_func_printf_directive_a="guessing no"])
              ;;
                                  # Guess yes on musl systems.
-           *-musl*)              gl_cv_func_printf_directive_a="guessing yes";;
+           *-musl* | midipix*)   gl_cv_func_printf_directive_a="guessing yes";;
                                  # Guess no on Android.
            linux*-android*)      gl_cv_func_printf_directive_a="guessing no";;
                                  # Guess no on native Windows.
@@ -643,7 +643,7 @@ changequote(,)dnl
                                  # Guess yes on glibc systems.
            *-gnu* | gnu*)        gl_cv_func_printf_directive_f="guessing yes";;
                                  # Guess yes on musl systems.
-           *-musl*)              gl_cv_func_printf_directive_f="guessing yes";;
+           *-musl* | midipix*)   gl_cv_func_printf_directive_f="guessing yes";;
                                  # Guess yes on FreeBSD >= 6.
            freebsd[1-5].*)       gl_cv_func_printf_directive_f="guessing no";;
            freebsd* | kfreebsd*) gl_cv_func_printf_directive_f="guessing yes";;
@@ -990,18 +990,18 @@ int main ()
         [
 changequote(,)dnl
          case "$host_os" in
-                            # Guess yes on glibc systems.
-           *-gnu* | gnu*)   gl_cv_func_printf_flag_zero="guessing yes";;
-                            # Guess yes on musl systems.
-           *-musl*)         gl_cv_func_printf_flag_zero="guessing yes";;
-                            # Guess yes on BeOS.
-           beos*)           gl_cv_func_printf_flag_zero="guessing yes";;
-                            # Guess no on Android.
-           linux*-android*) gl_cv_func_printf_flag_zero="guessing no";;
-                            # Guess no on native Windows.
-           mingw*)          gl_cv_func_printf_flag_zero="guessing no";;
-                            # If we don't know, obey --enable-cross-guesses.
-           *)               gl_cv_func_printf_flag_zero="$gl_cross_guess_normal";;
+                               # Guess yes on glibc systems.
+           *-gnu* | gnu*)      gl_cv_func_printf_flag_zero="guessing yes";;
+                               # Guess yes on musl systems.
+           *-musl* | midipix*) gl_cv_func_printf_flag_zero="guessing yes";;
+                               # Guess yes on BeOS.
+           beos*)              gl_cv_func_printf_flag_zero="guessing yes";;
+                               # Guess no on Android.
+           linux*-android*)    gl_cv_func_printf_flag_zero="guessing no";;
+                               # Guess no on native Windows.
+           mingw*)             gl_cv_func_printf_flag_zero="guessing no";;
+                               # If we don't know, obey --enable-cross-guesses.
+           *)                  gl_cv_func_printf_flag_zero="$gl_cross_guess_normal";;
          esac
 changequote([,])dnl
         ])
@@ -1239,7 +1239,7 @@ changequote(,)dnl
                                  # Guess yes on glibc systems.
            *-gnu* | gnu*)        gl_cv_func_snprintf_truncation_c99="guessing yes";;
                                  # Guess yes on musl systems.
-           *-musl*)              gl_cv_func_snprintf_truncation_c99="guessing yes";;
+           *-musl* | midipix*)   gl_cv_func_snprintf_truncation_c99="guessing yes";;
                                  # Guess yes on FreeBSD >= 5.
            freebsd[1-4].*)       gl_cv_func_snprintf_truncation_c99="guessing no";;
            freebsd* | kfreebsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
@@ -1344,7 +1344,7 @@ changequote(,)dnl
                                  # Guess yes on glibc systems.
            *-gnu* | gnu*)        gl_cv_func_snprintf_retval_c99="guessing yes";;
                                  # Guess yes on musl systems.
-           *-musl*)              gl_cv_func_snprintf_retval_c99="guessing yes";;
+           *-musl* | midipix*)   gl_cv_func_snprintf_retval_c99="guessing yes";;
                                  # Guess yes on FreeBSD >= 5.
            freebsd[1-4].*)       gl_cv_func_snprintf_retval_c99="guessing no";;
            freebsd* | kfreebsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
@@ -1447,7 +1447,7 @@ int main ()
                                  ;;
 changequote(,)dnl
                                  # Guess yes on musl systems.
-           *-musl*)              gl_cv_func_snprintf_directive_n="guessing yes";;
+           *-musl* | midipix*)   gl_cv_func_snprintf_directive_n="guessing yes";;
                                  # Guess yes on FreeBSD >= 5.
            freebsd[1-4].*)       gl_cv_func_snprintf_directive_n="guessing no";;
            freebsd* | kfreebsd*) gl_cv_func_snprintf_directive_n="guessing yes";;
@@ -1604,7 +1604,7 @@ changequote(,)dnl
                                  # Guess yes on glibc systems.
            *-gnu* | gnu*)        gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
                                  # Guess yes on musl systems.
-           *-musl*)              gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
+           *-musl* | midipix*)   gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
                                  # Guess yes on FreeBSD >= 5.
            freebsd[1-4].*)       gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
            freebsd* | kfreebsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
diff --git a/m4/pthread_rwlock_rdlock.m4 b/m4/pthread_rwlock_rdlock.m4
index ae6a885326..66b29f8963 100644
--- a/m4/pthread_rwlock_rdlock.m4
+++ b/m4/pthread_rwlock_rdlock.m4
@@ -1,4 +1,4 @@
-# pthread_rwlock_rdlock.m4 serial 4
+# pthread_rwlock_rdlock.m4 serial 5
 dnl Copyright (C) 2017-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -156,22 +156,22 @@ main ()
        [gl_cv_pthread_rwlock_rdlock_prefer_writer=yes],
        [gl_cv_pthread_rwlock_rdlock_prefer_writer=no],
        [case "$host_os" in
-                         # Guess no on glibc systems.
-          *-gnu* | gnu*) gl_cv_pthread_rwlock_rdlock_prefer_writer="guessing no" ;;
-                         # Guess no on musl systems.
-          *-musl*)       gl_cv_pthread_rwlock_rdlock_prefer_writer="guessing no" ;;
-                         # Guess no on bionic systems.
-          *-android*)    gl_cv_pthread_rwlock_rdlock_prefer_writer="guessing no" ;;
-                         # Guess yes on native Windows with the mingw-w64 winpthreads library.
-                         # Guess no on native Windows with the gnulib windows-rwlock module.
-          mingw*)        if test "$gl_use_threads" = yes || test "$gl_use_threads" = posix; then
-                           gl_cv_pthread_rwlock_rdlock_prefer_writer="guessing yes"
-                         else
-                           gl_cv_pthread_rwlock_rdlock_prefer_writer="guessing no"
-                         fi
-                         ;;
-                         # If we don't know, obey --enable-cross-guesses.
-          *)             gl_cv_pthread_rwlock_rdlock_prefer_writer="$gl_cross_guess_normal" ;;
+                              # Guess no on glibc systems.
+          *-gnu* | gnu*)      gl_cv_pthread_rwlock_rdlock_prefer_writer="guessing no" ;;
+                              # Guess no on musl systems.
+          *-musl* | midipix*) gl_cv_pthread_rwlock_rdlock_prefer_writer="guessing no" ;;
+                              # Guess no on bionic systems.
+          *-android*)         gl_cv_pthread_rwlock_rdlock_prefer_writer="guessing no" ;;
+                              # Guess yes on native Windows with the mingw-w64 winpthreads library.
+                              # Guess no on native Windows with the gnulib windows-rwlock module.
+          mingw*)             if test "$gl_use_threads" = yes || test "$gl_use_threads" = posix; then
+                                gl_cv_pthread_rwlock_rdlock_prefer_writer="guessing yes"
+                              else
+                                gl_cv_pthread_rwlock_rdlock_prefer_writer="guessing no"
+                              fi
+                              ;;
+                              # If we don't know, obey --enable-cross-guesses.
+          *)                  gl_cv_pthread_rwlock_rdlock_prefer_writer="$gl_cross_guess_normal" ;;
          esac
        ])
      LIBS="$save_LIBS"
diff --git a/m4/putenv.m4 b/m4/putenv.m4
index cc8c74c053..d37a60213f 100644
--- a/m4/putenv.m4
+++ b/m4/putenv.m4
@@ -1,4 +1,4 @@
-# putenv.m4 serial 25
+# putenv.m4 serial 26
 dnl Copyright (C) 2002-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -38,14 +38,14 @@ AC_DEFUN([gl_FUNC_PUTENV],
        [gl_cv_func_svid_putenv=no],
        [dnl When crosscompiling, assume putenv is broken.
         case "$host_os" in
-                         # Guess yes on glibc systems.
-          *-gnu* | gnu*) gl_cv_func_svid_putenv="guessing yes" ;;
-                         # Guess yes on musl systems.
-          *-musl*)       gl_cv_func_svid_putenv="guessing yes" ;;
-                         # Guess no on native Windows.
-          mingw*)        gl_cv_func_svid_putenv="guessing no" ;;
-                         # If we don't know, obey --enable-cross-guesses.
-          *)             gl_cv_func_svid_putenv="$gl_cross_guess_normal" ;;
+                              # Guess yes on glibc systems.
+          *-gnu* | gnu*)      gl_cv_func_svid_putenv="guessing yes" ;;
+                              # Guess yes on musl systems.
+          *-musl* | midipix*) gl_cv_func_svid_putenv="guessing yes" ;;
+                              # Guess no on native Windows.
+          mingw*)             gl_cv_func_svid_putenv="guessing no" ;;
+                              # If we don't know, obey --enable-cross-guesses.
+          *)                  gl_cv_func_svid_putenv="$gl_cross_guess_normal" ;;
         esac
        ])
     ])
diff --git a/m4/realloc.m4 b/m4/realloc.m4
index d22138fc7a..26053914cb 100644
--- a/m4/realloc.m4
+++ b/m4/realloc.m4
@@ -1,4 +1,4 @@
-# realloc.m4 serial 26
+# realloc.m4 serial 27
 dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -25,7 +25,7 @@ AC_DEFUN([_AC_FUNC_REALLOC_IF],
        [case "$host_os" in
           # Guess yes on platforms where we know the result.
           *-gnu* | freebsd* | netbsd* | openbsd* | bitrig* \
-          | gnu* | *-musl* | midnightbsd* \
+          | gnu* | *-musl* | midipix* | midnightbsd* \
           | hpux* | solaris* | cygwin* | mingw* | msys* )
             ac_cv_func_realloc_0_nonnull="guessing yes" ;;
           # If we don't know, obey --enable-cross-guesses.
diff --git a/m4/remainder.m4 b/m4/remainder.m4
index be81485c3c..0e79bd7d03 100644
--- a/m4/remainder.m4
+++ b/m4/remainder.m4
@@ -1,4 +1,4 @@
-# remainder.m4 serial 9
+# remainder.m4 serial 10
 dnl Copyright (C) 2012-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -92,14 +92,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_remainder_ieee=yes],
               [gl_cv_func_remainder_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_remainder_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_remainder_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_remainder_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_remainder_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_remainder_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_remainder_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_remainder_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_remainder_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/remainderf.m4 b/m4/remainderf.m4
index bc3dbc4b53..10ed65a405 100644
--- a/m4/remainderf.m4
+++ b/m4/remainderf.m4
@@ -1,4 +1,4 @@
-# remainderf.m4 serial 13
+# remainderf.m4 serial 14
 dnl Copyright (C) 2012-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -95,14 +95,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_remainderf_ieee=yes],
               [gl_cv_func_remainderf_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_remainderf_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_remainderf_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_remainderf_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_remainderf_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_remainderf_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_remainderf_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_remainderf_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_remainderf_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/remainderl.m4 b/m4/remainderl.m4
index e893250bae..3282cc86ce 100644
--- a/m4/remainderl.m4
+++ b/m4/remainderl.m4
@@ -1,4 +1,4 @@
-# remainderl.m4 serial 13
+# remainderl.m4 serial 14
 dnl Copyright (C) 2012-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -100,14 +100,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_remainderl_ieee=yes],
               [gl_cv_func_remainderl_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_remainderl_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_remainderl_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_remainderl_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_remainderl_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_remainderl_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_remainderl_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_remainderl_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_remainderl_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
@@ -239,16 +239,16 @@ int main (int argc, char *argv[])
         [gl_cv_func_remainderl_works=yes],
         [gl_cv_func_remainderl_works=no],
         [case "$host_os" in
-                          # Guess yes on glibc systems.
-           *-gnu* | gnu*) gl_cv_func_remainderl_works="guessing yes" ;;
-                          # Guess no on musl systems.
-           *-musl*)       gl_cv_func_remainderl_works="guessing no" ;;
-                          # Guess no on OpenBSD.
-           openbsd*)      gl_cv_func_remainderl_works="guessing no" ;;
-                          # Guess yes on native Windows.
-           mingw*)        gl_cv_func_remainderl_works="guessing yes" ;;
-                          # If we don't know, obey --enable-cross-guesses.
-           *)             gl_cv_func_remainderl_works="$gl_cross_guess_normal" ;;
+                               # Guess yes on glibc systems.
+           *-gnu* | gnu*)      gl_cv_func_remainderl_works="guessing yes" ;;
+                               # Guess no on musl systems.
+           *-musl* | midipix*) gl_cv_func_remainderl_works="guessing no" ;;
+                               # Guess no on OpenBSD.
+           openbsd*)           gl_cv_func_remainderl_works="guessing no" ;;
+                               # Guess yes on native Windows.
+           mingw*)             gl_cv_func_remainderl_works="guessing yes" ;;
+                               # If we don't know, obey --enable-cross-guesses.
+           *)                  gl_cv_func_remainderl_works="$gl_cross_guess_normal" ;;
          esac
         ])
     ])
diff --git a/m4/rintl.m4 b/m4/rintl.m4
index 8841396395..cb9bff55c2 100644
--- a/m4/rintl.m4
+++ b/m4/rintl.m4
@@ -1,4 +1,4 @@
-# rintl.m4 serial 8
+# rintl.m4 serial 9
 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -50,14 +50,14 @@ int main (int argc, char *argv[])
             [gl_cv_func_rintl_works=yes],
             [gl_cv_func_rintl_works=no],
             [case "$host_os" in
-                              # Guess yes on glibc systems.
-               *-gnu* | gnu*) gl_cv_func_rintl_works="guessing yes" ;;
-                              # Guess yes on musl systems.
-               *-musl*)       gl_cv_func_rintl_works="guessing yes" ;;
-                              # Guess yes on native Windows.
-               mingw*)        gl_cv_func_rintl_works="guessing yes" ;;
-                              # If we don't know, obey --enable-cross-guesses.
-               *)             gl_cv_func_rintl_works="$gl_cross_guess_normal" ;;
+                                   # Guess yes on glibc systems.
+               *-gnu* | gnu*)      gl_cv_func_rintl_works="guessing yes" ;;
+                                   # Guess yes on musl systems.
+               *-musl* | midipix*) gl_cv_func_rintl_works="guessing yes" ;;
+                                   # Guess yes on native Windows.
+               mingw*)             gl_cv_func_rintl_works="guessing yes" ;;
+                                   # If we don't know, obey --enable-cross-guesses.
+               *)                  gl_cv_func_rintl_works="$gl_cross_guess_normal" ;;
              esac
             ])
           LIBS="$save_LIBS"
diff --git a/m4/round.m4 b/m4/round.m4
index 6e70a1fc06..febc098ef9 100644
--- a/m4/round.m4
+++ b/m4/round.m4
@@ -1,4 +1,4 @@
-# round.m4 serial 23
+# round.m4 serial 24
 dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -113,21 +113,21 @@ int main (int argc, char *argv[])
               [gl_cv_func_round_ieee=yes],
               [gl_cv_func_round_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_round_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_round_ieee="guessing yes" ;;
-                                # Guess yes on MSVC, no on mingw.
-                 mingw*)        AC_EGREP_CPP([Known], [
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_round_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_round_ieee="guessing yes" ;;
+                                     # Guess yes on MSVC, no on mingw.
+                 mingw*)             AC_EGREP_CPP([Known], [
 #ifdef _MSC_VER
  Known
 #endif
-                                  ],
-                                  [gl_cv_func_round_ieee="guessing yes"],
-                                  [gl_cv_func_round_ieee="guessing no"])
-                                ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_round_ieee="$gl_cross_guess_normal" ;;
+                                       ],
+                                       [gl_cv_func_round_ieee="guessing yes"],
+                                       [gl_cv_func_round_ieee="guessing no"])
+                                     ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_round_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/roundf.m4 b/m4/roundf.m4
index f5b0056964..ca8f6398b4 100644
--- a/m4/roundf.m4
+++ b/m4/roundf.m4
@@ -1,4 +1,4 @@
-# roundf.m4 serial 24
+# roundf.m4 serial 25
 dnl Copyright (C) 2007-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -113,21 +113,21 @@ int main (int argc, char *argv[])
               [gl_cv_func_roundf_ieee=yes],
               [gl_cv_func_roundf_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_roundf_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_roundf_ieee="guessing yes" ;;
-                                # Guess yes on MSVC, no on mingw.
-                 mingw*)        AC_EGREP_CPP([Known], [
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_roundf_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_roundf_ieee="guessing yes" ;;
+                                     # Guess yes on MSVC, no on mingw.
+                 mingw*)             AC_EGREP_CPP([Known], [
 #ifdef _MSC_VER
  Known
 #endif
-                                  ],
-                                  [gl_cv_func_roundf_ieee="guessing yes"],
-                                  [gl_cv_func_roundf_ieee="guessing no"])
-                                ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_roundf_ieee="$gl_cross_guess_normal" ;;
+                                       ],
+                                       [gl_cv_func_roundf_ieee="guessing yes"],
+                                       [gl_cv_func_roundf_ieee="guessing no"])
+                                     ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_roundf_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/roundl.m4 b/m4/roundl.m4
index 9e9a8e1c06..f23378cfb5 100644
--- a/m4/roundl.m4
+++ b/m4/roundl.m4
@@ -1,4 +1,4 @@
-# roundl.m4 serial 20
+# roundl.m4 serial 21
 dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -64,14 +64,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_roundl_ieee=yes],
               [gl_cv_func_roundl_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_roundl_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_roundl_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_roundl_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_roundl_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_roundl_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_roundl_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_roundl_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_roundl_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/setenv.m4 b/m4/setenv.m4
index c0b7475606..ef068ad879 100644
--- a/m4/setenv.m4
+++ b/m4/setenv.m4
@@ -1,4 +1,4 @@
-# setenv.m4 serial 31
+# setenv.m4 serial 32
 dnl Copyright (C) 2001-2004, 2006-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -35,12 +35,12 @@ AC_DEFUN([gl_FUNC_SETENV],
       ]])],
       [gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no],
       [case "$host_os" in
-                        # Guess yes on glibc systems.
-         *-gnu* | gnu*) gl_cv_func_setenv_works="guessing yes" ;;
-                        # Guess yes on musl systems.
-         *-musl*)       gl_cv_func_setenv_works="guessing yes" ;;
-                        # If we don't know, obey --enable-cross-guesses.
-         *)             gl_cv_func_setenv_works="$gl_cross_guess_normal" ;;
+                             # Guess yes on glibc systems.
+         *-gnu* | gnu*)      gl_cv_func_setenv_works="guessing yes" ;;
+                             # Guess yes on musl systems.
+         *-musl* | midipix*) gl_cv_func_setenv_works="guessing yes" ;;
+                             # If we don't know, obey --enable-cross-guesses.
+         *)                  gl_cv_func_setenv_works="$gl_cross_guess_normal" ;;
        esac
       ])])
     case "$gl_cv_func_setenv_works" in
diff --git a/m4/setlocale_null.m4 b/m4/setlocale_null.m4
index b41df499a8..1105d693fe 100644
--- a/m4/setlocale_null.m4
+++ b/m4/setlocale_null.m4
@@ -1,4 +1,4 @@
-# setlocale_null.m4 serial 7
+# setlocale_null.m4 serial 8
 dnl Copyright (C) 2019-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -14,7 +14,7 @@ AC_DEFUN([gl_FUNC_SETLOCALE_NULL],
     [gl_cv_func_setlocale_null_all_mtsafe],
     [case "$host_os" in
        # Guess no on musl libc, macOS, FreeBSD, NetBSD, OpenBSD, AIX, Haiku.
-       *-musl* | darwin* | freebsd* | midnightbsd* | netbsd* | openbsd* | aix* | haiku*)
+       *-musl* | midipix* | darwin* | freebsd* | midnightbsd* | netbsd* | openbsd* | aix* | haiku*)
          gl_cv_func_setlocale_null_all_mtsafe=no ;;
        # Guess no on Cygwin < 3.4.6.
        cygwin*)
@@ -62,7 +62,7 @@ AC_DEFUN([gl_FUNC_SETLOCALE_NULL],
        openbsd* | aix*)
          gl_cv_func_setlocale_null_one_mtsafe=no ;;
        # Guess yes on glibc, musl libc, macOS, FreeBSD, NetBSD, HP-UX, IRIX, Solaris, Haiku, Cygwin, native Windows.
-       *-gnu* | gnu* | *-musl* | darwin* | freebsd* | midnightbsd* | netbsd* | hpux* | irix* | solaris* | haiku* | cygwin* | mingw*)
+       *-gnu* | gnu* | *-musl* | midipix* | darwin* | freebsd* | midnightbsd* | netbsd* | hpux* | irix* | solaris* | haiku* | cygwin* | mingw*)
          gl_cv_func_setlocale_null_one_mtsafe=yes ;;
        # If we don't know, obey --enable-cross-guesses.
        *)
diff --git a/m4/signbit.m4 b/m4/signbit.m4
index f957884340..2fea73f854 100644
--- a/m4/signbit.m4
+++ b/m4/signbit.m4
@@ -1,4 +1,4 @@
-# signbit.m4 serial 20
+# signbit.m4 serial 21
 dnl Copyright (C) 2007-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -29,14 +29,14 @@ AC_DEFUN([gl_SIGNBIT],
         [gl_cv_func_signbit=yes],
         [gl_cv_func_signbit=no],
         [case "$host_os" in
-                          # Guess yes on glibc systems.
-           *-gnu* | gnu*) gl_cv_func_signbit="guessing yes" ;;
-                          # Guess yes on musl systems.
-           *-musl*)       gl_cv_func_signbit="guessing yes" ;;
-                          # Guess yes on native Windows.
-           mingw*)        gl_cv_func_signbit="guessing yes" ;;
-                          # If we don't know, obey --enable-cross-guesses.
-           *)             gl_cv_func_signbit="$gl_cross_guess_normal" ;;
+                               # Guess yes on glibc systems.
+           *-gnu* | gnu*)      gl_cv_func_signbit="guessing yes" ;;
+                               # Guess yes on musl systems.
+           *-musl* | midipix*) gl_cv_func_signbit="guessing yes" ;;
+                               # Guess yes on native Windows.
+           mingw*)             gl_cv_func_signbit="guessing yes" ;;
+                               # If we don't know, obey --enable-cross-guesses.
+           *)                  gl_cv_func_signbit="$gl_cross_guess_normal" ;;
          esac
         ])
     ])
@@ -63,19 +63,19 @@ AC_DEFUN([gl_SIGNBIT],
         [gl_cv_func_signbit_builtins=yes],
         [gl_cv_func_signbit_builtins=no],
         [case "$host_os" in
-                          # Guess yes on glibc systems.
-           *-gnu* | gnu*) gl_cv_func_signbit_builtins="guessing yes" ;;
-                          # Guess yes on musl systems.
-           *-musl*)       gl_cv_func_signbit_builtins="guessing yes" ;;
-                          # Guess yes on mingw, no on MSVC.
-           mingw*)        if test -n "$GCC"; then
-                            gl_cv_func_signbit_builtins="guessing yes"
-                          else
-                            gl_cv_func_signbit_builtins="guessing no"
-                          fi
-                          ;;
-                          # If we don't know, obey --enable-cross-guesses.
-           *)             gl_cv_func_signbit_builtins="$gl_cross_guess_normal" ;;
+                               # Guess yes on glibc systems.
+           *-gnu* | gnu*)      gl_cv_func_signbit_builtins="guessing yes" ;;
+                               # Guess yes on musl systems.
+           *-musl* | midipix*) gl_cv_func_signbit_builtins="guessing yes" ;;
+                               # Guess yes on mingw, no on MSVC.
+           mingw*)             if test -n "$GCC"; then
+                                 gl_cv_func_signbit_builtins="guessing yes"
+                               else
+                                 gl_cv_func_signbit_builtins="guessing no"
+                               fi
+                               ;;
+                               # If we don't know, obey --enable-cross-guesses.
+           *)                  gl_cv_func_signbit_builtins="$gl_cross_guess_normal" ;;
          esac
         ])
     ])
diff --git a/m4/stpncpy.m4 b/m4/stpncpy.m4
index b9850364ed..073607004b 100644
--- a/m4/stpncpy.m4
+++ b/m4/stpncpy.m4
@@ -1,4 +1,4 @@
-# stpncpy.m4 serial 21
+# stpncpy.m4 serial 22
 dnl Copyright (C) 2002-2003, 2005-2007, 2009-2023 Free Software Foundation,
 dnl Inc.
 dnl This file is free software; the Free Software Foundation
@@ -79,8 +79,8 @@ int main ()
 #endif
 ],         [gl_cv_func_stpncpy="guessing yes"],
            [case "$host_os" in
-              *-musl*) gl_cv_func_stpncpy="guessing yes" ;;
-              *)       gl_cv_func_stpncpy="$gl_cross_guess_normal" ;;
+              *-musl* | midipix*) gl_cv_func_stpncpy="guessing yes" ;;
+              *)                  gl_cv_func_stpncpy="$gl_cross_guess_normal" ;;
             esac
            ])
         ])
diff --git a/m4/strerror.m4 b/m4/strerror.m4
index 8879eb08bb..9f1dddd599 100644
--- a/m4/strerror.m4
+++ b/m4/strerror.m4
@@ -1,4 +1,4 @@
-# strerror.m4 serial 23
+# strerror.m4 serial 24
 dnl Copyright (C) 2002, 2007-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -24,12 +24,12 @@ AC_DEFUN([gl_FUNC_STRERROR],
         [gl_cv_func_working_strerror=yes],
         [gl_cv_func_working_strerror=no],
         [case "$host_os" in
-                          # Guess yes on glibc systems.
-           *-gnu* | gnu*) gl_cv_func_working_strerror="guessing yes" ;;
-                          # Guess yes on musl systems.
-           *-musl*)       gl_cv_func_working_strerror="guessing yes" ;;
-                          # If we don't know, obey --enable-cross-guesses.
-           *)             gl_cv_func_working_strerror="$gl_cross_guess_normal" ;;
+                               # Guess yes on glibc systems.
+           *-gnu* | gnu*)      gl_cv_func_working_strerror="guessing yes" ;;
+                               # Guess yes on musl systems.
+           *-musl* | midipix*) gl_cv_func_working_strerror="guessing yes" ;;
+                               # If we don't know, obey --enable-cross-guesses.
+           *)                  gl_cv_func_working_strerror="$gl_cross_guess_normal" ;;
          esac
         ])
     ])
@@ -80,14 +80,14 @@ AC_DEFUN([gl_FUNC_STRERROR_0],
       [gl_cv_func_strerror_0_works=yes],
       [gl_cv_func_strerror_0_works=no],
       [case "$host_os" in
-                        # Guess yes on glibc systems.
-         *-gnu* | gnu*) gl_cv_func_strerror_0_works="guessing yes" ;;
-                        # Guess yes on musl systems.
-         *-musl*)       gl_cv_func_strerror_0_works="guessing yes" ;;
-                        # Guess yes on native Windows.
-         mingw*)        gl_cv_func_strerror_0_works="guessing yes" ;;
-                        # If we don't know, obey --enable-cross-guesses.
-         *)             gl_cv_func_strerror_0_works="$gl_cross_guess_normal" ;;
+                             # Guess yes on glibc systems.
+         *-gnu* | gnu*)      gl_cv_func_strerror_0_works="guessing yes" ;;
+                             # Guess yes on musl systems.
+         *-musl* | midipix*) gl_cv_func_strerror_0_works="guessing yes" ;;
+                             # Guess yes on native Windows.
+         mingw*)             gl_cv_func_strerror_0_works="guessing yes" ;;
+                             # If we don't know, obey --enable-cross-guesses.
+         *)                  gl_cv_func_strerror_0_works="$gl_cross_guess_normal" ;;
        esac
       ])
   ])
diff --git a/m4/strtod.m4 b/m4/strtod.m4
index e4e0f06dfb..ae7446c2fa 100644
--- a/m4/strtod.m4
+++ b/m4/strtod.m4
@@ -1,4 +1,4 @@
-# strtod.m4 serial 27
+# strtod.m4 serial 28
 dnl Copyright (C) 2002-2003, 2006-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -115,11 +115,11 @@ numeric_equal (double x, double y)
            ],
            [gl_cv_func_strtod_works="guessing yes"],
            [case "$host_os" in
-                       # Guess yes on musl systems.
-              *-musl*) gl_cv_func_strtod_works="guessing yes" ;;
-                       # Guess yes on native Windows.
-              mingw*)  gl_cv_func_strtod_works="guessing yes" ;;
-              *)       gl_cv_func_strtod_works="$gl_cross_guess_normal" ;;
+                                  # Guess yes on musl systems.
+              *-musl* | midipix*) gl_cv_func_strtod_works="guessing yes" ;;
+                                  # Guess yes on native Windows.
+              mingw*)             gl_cv_func_strtod_works="guessing yes" ;;
+              *)                  gl_cv_func_strtod_works="$gl_cross_guess_normal" ;;
             esac
            ])
         ])
diff --git a/m4/strtold.m4 b/m4/strtold.m4
index 08a722b199..4206fba36d 100644
--- a/m4/strtold.m4
+++ b/m4/strtold.m4
@@ -1,4 +1,4 @@
-# strtold.m4 serial 8
+# strtold.m4 serial 9
 dnl Copyright (C) 2002-2003, 2006-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -114,11 +114,11 @@ numeric_equal (long double x, long double y)
            ],
            [gl_cv_func_strtold_works="guessing yes"],
            [case "$host_os" in
-                       # Guess yes on musl systems.
-              *-musl*) gl_cv_func_strtold_works="guessing yes" ;;
-                       # Guess 'no (underflow problem)' on Cygwin.
-              cygwin*) gl_cv_func_strtold_works="guessing no (underflow problem)" ;;
-              *)       gl_cv_func_strtold_works="$gl_cross_guess_normal" ;;
+                                  # Guess yes on musl systems.
+              *-musl* | midipix*) gl_cv_func_strtold_works="guessing yes" ;;
+                                  # Guess 'no (underflow problem)' on Cygwin.
+              cygwin*)            gl_cv_func_strtold_works="guessing no (underflow problem)" ;;
+              *)                  gl_cv_func_strtold_works="$gl_cross_guess_normal" ;;
             esac
            ])
         ])
diff --git a/m4/trunc.m4 b/m4/trunc.m4
index 154afc67da..287fb67133 100644
--- a/m4/trunc.m4
+++ b/m4/trunc.m4
@@ -1,4 +1,4 @@
-# trunc.m4 serial 15
+# trunc.m4 serial 16
 dnl Copyright (C) 2007, 2010-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -72,14 +72,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_trunc_ieee=yes],
               [gl_cv_func_trunc_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_trunc_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_trunc_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_trunc_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_trunc_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_trunc_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_trunc_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_trunc_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_trunc_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/truncf.m4 b/m4/truncf.m4
index e22e43cb45..71469946ed 100644
--- a/m4/truncf.m4
+++ b/m4/truncf.m4
@@ -1,4 +1,4 @@
-# truncf.m4 serial 15
+# truncf.m4 serial 16
 dnl Copyright (C) 2007, 2010-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -72,14 +72,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_truncf_ieee=yes],
               [gl_cv_func_truncf_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_truncf_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_truncf_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_truncf_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_truncf_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_truncf_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_truncf_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_truncf_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_truncf_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/truncl.m4 b/m4/truncl.m4
index 5cd5587c2f..57bec00f0a 100644
--- a/m4/truncl.m4
+++ b/m4/truncl.m4
@@ -1,4 +1,4 @@
-# truncl.m4 serial 17
+# truncl.m4 serial 18
 dnl Copyright (C) 2007-2008, 2010-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -105,14 +105,14 @@ int main (int argc, char *argv[])
               [gl_cv_func_truncl_ieee=yes],
               [gl_cv_func_truncl_ieee=no],
               [case "$host_os" in
-                                # Guess yes on glibc systems.
-                 *-gnu* | gnu*) gl_cv_func_truncl_ieee="guessing yes" ;;
-                                # Guess yes on musl systems.
-                 *-musl*)       gl_cv_func_truncl_ieee="guessing yes" ;;
-                                # Guess yes on native Windows.
-                 mingw*)        gl_cv_func_truncl_ieee="guessing yes" ;;
-                                # If we don't know, obey --enable-cross-guesses.
-                 *)             gl_cv_func_truncl_ieee="$gl_cross_guess_normal" ;;
+                                     # Guess yes on glibc systems.
+                 *-gnu* | gnu*)      gl_cv_func_truncl_ieee="guessing yes" ;;
+                                     # Guess yes on musl systems.
+                 *-musl* | midipix*) gl_cv_func_truncl_ieee="guessing yes" ;;
+                                     # Guess yes on native Windows.
+                 mingw*)             gl_cv_func_truncl_ieee="guessing yes" ;;
+                                     # If we don't know, obey --enable-cross-guesses.
+                 *)                  gl_cv_func_truncl_ieee="$gl_cross_guess_normal" ;;
                esac
               ])
             LIBS="$save_LIBS"
diff --git a/m4/ungetc.m4 b/m4/ungetc.m4
index 8977a346dd..77274778f3 100644
--- a/m4/ungetc.m4
+++ b/m4/ungetc.m4
@@ -1,4 +1,4 @@
-# ungetc.m4 serial 10
+# ungetc.m4 serial 11
 dnl Copyright (C) 2009-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -42,16 +42,16 @@ AC_DEFUN_ONCE([gl_FUNC_UNGETC_WORKS],
           ]])],
         [gl_cv_func_ungetc_works=yes], [gl_cv_func_ungetc_works=no],
         [case "$host_os" in
-                          # Guess yes on glibc systems.
-           *-gnu* | gnu*) gl_cv_func_ungetc_works="guessing yes" ;;
-                          # Guess yes on musl systems.
-           *-musl*)       gl_cv_func_ungetc_works="guessing yes" ;;
-                          # Guess yes on bionic systems.
-           *-android*)    gl_cv_func_ungetc_works="guessing yes" ;;
-                          # Guess yes on native Windows.
-           mingw*)        gl_cv_func_ungetc_works="guessing yes" ;;
-                          # If we don't know, obey --enable-cross-guesses.
-           *)             gl_cv_func_ungetc_works="$gl_cross_guess_normal" ;;
+                               # Guess yes on glibc systems.
+           *-gnu* | gnu*)      gl_cv_func_ungetc_works="guessing yes" ;;
+                               # Guess yes on musl systems.
+           *-musl* | midipix*) gl_cv_func_ungetc_works="guessing yes" ;;
+                               # Guess yes on bionic systems.
+           *-android*)         gl_cv_func_ungetc_works="guessing yes" ;;
+                               # Guess yes on native Windows.
+           mingw*)             gl_cv_func_ungetc_works="guessing yes" ;;
+                               # If we don't know, obey --enable-cross-guesses.
+           *)                  gl_cv_func_ungetc_works="$gl_cross_guess_normal" ;;
          esac
         ])
     ])
diff --git a/m4/wcwidth.m4 b/m4/wcwidth.m4
index f204f3d845..93a7fa329c 100644
--- a/m4/wcwidth.m4
+++ b/m4/wcwidth.m4
@@ -1,4 +1,4 @@
-# wcwidth.m4 serial 34
+# wcwidth.m4 serial 35
 dnl Copyright (C) 2006-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -86,13 +86,13 @@ int main ()
           [
 changequote(,)dnl
            case "$host_os" in
-                            # Guess yes on glibc systems.
-             *-gnu* | gnu*) gl_cv_func_wcwidth_works="guessing yes";;
-                            # Guess yes on musl systems.
-             *-musl*)       gl_cv_func_wcwidth_works="guessing yes";;
-                            # Guess yes on AIX 7 systems.
-             aix[7-9]*)     gl_cv_func_wcwidth_works="guessing yes";;
-             *)             gl_cv_func_wcwidth_works="$gl_cross_guess_normal";;
+                                 # Guess yes on glibc systems.
+             *-gnu* | gnu*)      gl_cv_func_wcwidth_works="guessing yes";;
+                                 # Guess yes on musl systems.
+             *-musl* | midipix*) gl_cv_func_wcwidth_works="guessing yes";;
+                                 # Guess yes on AIX 7 systems.
+             aix[7-9]*)          gl_cv_func_wcwidth_works="guessing yes";;
+             *)                  gl_cv_func_wcwidth_works="$gl_cross_guess_normal";;
            esac
 changequote([,])dnl
           ])