-# sys_types_h.m4 serial 4
-dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
+# sys_types_h.m4 serial 5
+dnl Copyright (C) 2011-2013 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_SYS_TYPES_H],
+AC_DEFUN_ONCE([gl_SYS_TYPES_H],
[
AC_REQUIRE([gl_SYS_TYPES_H_DEFAULTS])
gl_NEXT_HEADERS([sys/types.h])