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-rw-r--r--m4/c-stack.m43
1 files changed, 2 insertions, 1 deletions
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>