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diff --git a/m4/parse-datetime.m4 b/m4/parse-datetime.m4
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+++ b/m4/parse-datetime.m4
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+# parse-datetime.m4 serial 20
+dnl Copyright (C) 2002-2006, 2008-2012 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.
+
+dnl Define HAVE_COMPOUND_LITERALS if the C compiler supports compound literals
+dnl as in ISO C99.
+dnl Note that compound literals such as (struct s) { 3, 4 } can be used for
+dnl initialization of stack-allocated variables, but are not constant
+dnl expressions and therefore cannot be used as initializer for global or
+dnl static variables (even though gcc supports this in pre-C99 mode).
+AC_DEFUN([gl_C_COMPOUND_LITERALS],
+[
+  AC_CACHE_CHECK([for compound literals], [gl_cv_compound_literals],
+  [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[struct s { int i, j; };]],
+      [[struct s t = (struct s) { 3, 4 };
+        if (t.i != 0) return 0;]])],
+    gl_cv_compound_literals=yes,
+    gl_cv_compound_literals=no)])
+  if test $gl_cv_compound_literals = yes; then
+    AC_DEFINE([HAVE_COMPOUND_LITERALS], [1],
+      [Define if you have compound literals.])
+  fi
+])
+
+AC_DEFUN([gl_PARSE_DATETIME],
+[
+  dnl Prerequisites of lib/parse-datetime.h.
+  AC_REQUIRE([AM_STDBOOL_H])
+  AC_REQUIRE([gl_TIMESPEC])
+
+  dnl Prerequisites of lib/parse-datetime.y.
+  AC_REQUIRE([gl_BISON])
+  AC_REQUIRE([AC_C_INLINE])
+  AC_REQUIRE([gl_C_COMPOUND_LITERALS])
+  AC_STRUCT_TIMEZONE
+  AC_REQUIRE([gl_CLOCK_TIME])
+  AC_REQUIRE([gl_TM_GMTOFF])
+  AC_COMPILE_IFELSE(
+    [AC_LANG_SOURCE([[
+#include <time.h> /* for time_t */
+#include <limits.h> /* for CHAR_BIT, LONG_MIN, LONG_MAX */
+#define TYPE_MINIMUM(t) \
+  ((t) ((t) 0 < (t) -1 ? (t) 0 : ~ TYPE_MAXIMUM (t)))
+#define TYPE_MAXIMUM(t) \
+  ((t) ((t) 0 < (t) -1 \
+        ? (t) -1 \
+        : ((((t) 1 << (sizeof (t) * CHAR_BIT - 2)) - 1) * 2 + 1)))
+typedef int verify_min[2 * (LONG_MIN <= TYPE_MINIMUM (time_t)) - 1];
+typedef int verify_max[2 * (TYPE_MAXIMUM (time_t) <= LONG_MAX) - 1];
+       ]])],
+    [AC_DEFINE([TIME_T_FITS_IN_LONG_INT], [1],
+       [Define to 1 if all 'time_t' values fit in a 'long int'.])
+    ])
+])