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diff --git a/m4/intmax_t.m4 b/m4/intmax_t.m4
new file mode 100644
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+++ b/m4/intmax_t.m4
@@ -0,0 +1,61 @@
+# intmax_t.m4 serial 7
+dnl Copyright (C) 1997-2004, 2006-2007, 2009 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 From Paul Eggert.
+
+AC_PREREQ([2.13])
+
+# Define intmax_t to 'long' or 'long long'
+# if it is not already defined in <stdint.h> or <inttypes.h>.
+
+AC_DEFUN([gl_AC_TYPE_INTMAX_T],
+[
+  dnl For simplicity, we assume that a header file defines 'intmax_t' if and
+  dnl only if it defines 'uintmax_t'.
+  AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
+  AC_REQUIRE([gl_AC_HEADER_STDINT_H])
+  if test $gl_cv_header_inttypes_h = no && test $gl_cv_header_stdint_h = no; then
+    AC_REQUIRE([AC_TYPE_LONG_LONG_INT])
+    test $ac_cv_type_long_long_int = yes \
+      && ac_type='long long' \
+      || ac_type='long'
+    AC_DEFINE_UNQUOTED([intmax_t], [$ac_type],
+     [Define to long or long long if <inttypes.h> and <stdint.h> don't define.])
+  else
+    AC_DEFINE([HAVE_INTMAX_T], [1],
+      [Define if you have the 'intmax_t' type in <stdint.h> or <inttypes.h>.])
+  fi
+])
+
+dnl An alternative would be to explicitly test for 'intmax_t'.
+
+AC_DEFUN([gt_AC_TYPE_INTMAX_T],
+[
+  AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
+  AC_REQUIRE([gl_AC_HEADER_STDINT_H])
+  AC_CACHE_CHECK([for intmax_t], [gt_cv_c_intmax_t],
+    [AC_TRY_COMPILE([
+#include <stddef.h>
+#include <stdlib.h>
+#if HAVE_STDINT_H_WITH_UINTMAX
+#include <stdint.h>
+#endif
+#if HAVE_INTTYPES_H_WITH_UINTMAX
+#include <inttypes.h>
+#endif
+], [intmax_t x = -1; return !x;], gt_cv_c_intmax_t=yes, gt_cv_c_intmax_t=no)])
+  if test $gt_cv_c_intmax_t = yes; then
+    AC_DEFINE([HAVE_INTMAX_T], [1],
+      [Define if you have the 'intmax_t' type in <stdint.h> or <inttypes.h>.])
+  else
+    AC_REQUIRE([AC_TYPE_LONG_LONG_INT])
+    test $ac_cv_type_long_long_int = yes \
+      && ac_type='long long' \
+      || ac_type='long'
+    AC_DEFINE_UNQUOTED([intmax_t], [$ac_type],
+     [Define to long or long long if <stdint.h> and <inttypes.h> don't define.])
+  fi
+])