From 784604222e671bf5fcc4e2a2b6745d1f4b93a944 Mon Sep 17 00:00:00 2001
From: Jim Meyering <jim@meyering.net>
Date: Thu, 6 Feb 2003 13:06:29 +0000
Subject: Include <unistd.h>.  On some systems, it is required for the
 definition of _SC_PAGESIZE.

---
 m4/c-stack.m4 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/m4/c-stack.m4 b/m4/c-stack.m4
index 01c9a884c..a58cde009 100644
--- a/m4/c-stack.m4
+++ b/m4/c-stack.m4
@@ -1,6 +1,6 @@
 # Check prerequisites for compiling lib/c-stack.c.
 
-# Copyright (C) 2002 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2003 Free Software Foundation, Inc.
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -27,6 +27,7 @@ AC_DEFUN([AC_SYS_XSI_STACK_OVERFLOW_HEURISTIC],
      ac_cv_sys_xsi_stack_overflow_heuristic,
      [AC_TRY_RUN(
 	[
+	 #include <unistd.h>
 	 #include <signal.h>
 	 #include <ucontext.h>
 
-- 
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