-# strndup.m4 serial 20
+# strndup.m4 serial 21
dnl Copyright (C) 2002-2003, 2005-2012 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
[AC_RUN_IFELSE([
AC_LANG_PROGRAM([[#include <string.h>
#include <stdlib.h>]], [[
-#ifndef HAVE_DECL_STRNDUP
+#if !HAVE_DECL_STRNDUP
extern
#ifdef __cplusplus
"C"