-# memchr.m4 serial 6
+# memchr.m4 serial 7
dnl Copyright (C) 2002, 2003, 2004, 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.
-AC_DEFUN([gl_FUNC_MEMCHR],
+AC_DEFUN_ONCE([gl_FUNC_MEMCHR],
[
dnl Check for prerequisites for memory fence checks.
gl_FUNC_MMAP_ANON