2 files changed, 46 insertions, 0 deletions
diff --git a/gnulib b/gnulib
deleted file mode 160000
-Subproject 443bc5ffcf7429e557f4a371b0661abe98ddbc1
diff --git a/gnulib/m4/popen.m4 b/gnulib/m4/popen.m4
new file mode 100644
index 0000000..c958f19
--- /dev/null
+++ b/gnulib/m4/popen.m4
@@ -0,0 +1,46 @@
+# popen.m4 serial 5
+dnl Copyright (C) 2009-2011 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_POPEN],
+[
+  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
+  AC_CHECK_FUNCS_ONCE([popen])
+  if test $ac_cv_func_popen = no; then
+    HAVE_POPEN=0
+  else
+    AC_CACHE_CHECK([whether popen works with closed stdin],
+      [gl_cv_func_popen_works],
+      [
+        AC_RUN_IFELSE(
+          [AC_LANG_PROGRAM(
+             [[#include <stdio.h>]],
+             [[int result = 0;
+               FILE *child;
+               fclose (stdin);
+               fclose (stdout);
+               child = popen ("echo a", "r");
+               if (fgetc (child) != 'a')
+                 result |= 1;
+               if (pclose (child) != 0)
+                 result |= 2;
+               return result;
+             ]])],
+          [gl_cv_func_popen_works=yes],
+          [gl_cv_func_popen_works=no],
+          dnl For now, only cygwin 1.5 or older is known to be broken.
+          [gl_cv_func_popen_works='guessing yes'])
+      ])
+    if test "$gl_cv_func_popen_works" = no; then
+      REPLACE_POPEN=1
+    fi
+  fi
+])
+
+# Prerequisites of lib/popen.c.
+AC_DEFUN([gl_PREREQ_POPEN],
+[
+  :
+])