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# Define AC_USE_SYSTEM_EXTENSIONS only if it was previously undefined.
# This is needed to configure correctly with newer versions of autoconf.
--- tar-1.17/m4/extensions.m4.orig 2010-07-22 22:21:35.000000000 -0700
+++ tar-1.17/m4/extensions.m4 2010-07-22 22:23:41.000000000 -0700
@@ -1,4 +1,4 @@
-# serial 4 -*- Autoconf -*-
+# serial 5 -*- Autoconf -*-
# Enable extensions on systems that normally disable them.
# Copyright (C) 2003, 2006 Free Software Foundation, Inc.
@@ -16,6 +16,7 @@
# ------------------------
# Enable extensions on systems that normally disable them,
# typically due to standards-conformance issues.
+m4_ifdef([AC_USE_SYSTEM_EXTENSIONS], [], [
AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS],
[
AC_BEFORE([$0], [AC_COMPILE_IFELSE])
@@ -48,7 +49,7 @@
AC_DEFINE([__EXTENSIONS__])
AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
AC_DEFINE([_TANDEM_SOURCE])
-])
+])])
# gl_USE_SYSTEM_EXTENSIONS
# ------------------------
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