--- a/src/plat_boot_config.c
+++ b/src/plat_boot_config.c
@@ -18,6 +18,7 @@
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
+#define _GNU_SOURCE
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>