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-rw-r--r--m4/c32rtomb.m43
1 files changed, 2 insertions, 1 deletions
diff --git a/m4/c32rtomb.m4 b/m4/c32rtomb.m4
index 41c07e75c9..539e4f884c 100644
--- a/m4/c32rtomb.m4
+++ b/m4/c32rtomb.m4
@@ -1,4 +1,4 @@
-# c32rtomb.m4 serial 4
+# c32rtomb.m4 serial 5
dnl Copyright (C) 2020-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -53,6 +53,7 @@ changequote(,)dnl
changequote([,])dnl
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
+#include <stddef.h>
#include <uchar.h>
int main ()
{