From 0b550a4e7acf02d3478602848f6afbfcbfb0d4b2 Mon Sep 17 00:00:00 2001
From: Ross Burton <ross.burton@intel.com>
Date: Mon, 29 Jan 2018 16:24:36 +0000
Subject: [PATCH] configure.ac: call AC_USE_SYSTEM_EXTENSIONS

With glibc 2.27 memfd_create() is inside a _GNU_SOURCE guard, so call
AC_USE_SYSTEM_EXTENSIONS to get this defined.

Signed-off-by: Ross Burton <ross.burton@intel.com>
---
 configure.ac | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/configure.ac b/configure.ac
index 55772d0..ed77e6d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -28,6 +28,8 @@ AC_INIT([libxshmfence], [1.2],
 AC_CONFIG_SRCDIR([Makefile.am])
 AC_CONFIG_HEADERS([config.h])
 
+AC_USE_SYSTEM_EXTENSIONS
+
 # Initialize Automake
 AM_INIT_AUTOMAKE([foreign dist-bzip2])
 
-- 
2.16.0