config: define _GNU_SOURCE for asprintf

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/config.c b/config.c
index 9fb9c01..c2b7edf 100644
--- a/config.c
+++ b/config.c
@@ -11,6 +11,7 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */
+#define _GNU_SOURCE
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>