From 94bdf89bc45bce845f93a94ff6bc68ebabaf929a Mon Sep 17 00:00:00 2001
From: Christian Brauner <christian.brauner@ubuntu.com>
Date: Fri, 3 Sep 2021 17:57:39 +0200
Subject: [PATCH] build: make sure _GNU_SOURCE is set

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
 configure.ac | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure.ac b/configure.ac
index 1c579d2dc..df2d8a5d4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -44,6 +44,7 @@ AC_CANONICAL_HOST
 AM_PROG_CC_C_O
 AC_USE_SYSTEM_EXTENSIONS
 AC_SYS_LARGEFILE
+AC_GNU_SOURCE
 
 # Test if we have a new enough compiler.
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[