# HG changeset patch
# User Bruno Haible <bruno@clisp.org>
# Date 1250118590 -7200
# Node ID 8e0abc42d59f619ae96d7ca1f9ae5a38cb75a6a5
# Parent  0cb0c5c1d5c53946d26f8e0876da59afbb9b0f9a
Ensure that optarg etc. get declared by <unistd.h>.

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2009-08-12  Bruno Haible  <bruno@clisp.org>
+
+	Ensure that optarg etc. get declared by <unistd.h>.
+	* m4/getopt.m4 (gl_GETOPT_CHECK_HEADERS): Require
+	AC_USE_SYSTEM_EXTENSIONS.
+	* modules/getopt (Depends-on): Add 'extensions'.
+
 2009-08-12  Bruno Haible  <bruno@clisp.org>
 
 	Avoid test link errors.
diff --git a/m4/getopt.m4 b/m4/getopt.m4
--- a/m4/getopt.m4
+++ b/m4/getopt.m4
@@ -1,4 +1,4 @@
-# getopt.m4 serial 19
+# getopt.m4 serial 20
 dnl Copyright (C) 2002-2006, 2008-2009 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -41,6 +41,9 @@
 # Determine whether to replace the entire getopt facility.
 AC_DEFUN([gl_GETOPT_CHECK_HEADERS],
 [
+  dnl Persuade Solaris <unistd.h> to declare optarg, optind, opterr, optopt.
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
   gl_replace_getopt=
   if test -z "$gl_replace_getopt"; then
     AC_CHECK_HEADERS([getopt.h], [], [gl_replace_getopt=yes])
diff --git a/modules/getopt b/modules/getopt
--- a/modules/getopt
+++ b/modules/getopt
@@ -11,6 +11,7 @@
 Depends-on:
 gettext-h
 unistd
+extensions
 
 configure.ac:
 gl_GETOPT