upgraded: define __GNU_SOURCE

It is required on non-musl libcs for O_DIRECTORY.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

diff --git a/upgraded/upgraded.c b/upgraded/upgraded.c
index 79ebd37..e70f92d 100644 (file)
--- a/upgraded/upgraded.c
+++ b/upgraded/upgraded.c
@@ -12,6 +12,8 @@
  * GNU General Public License for more details.
  */
 
+#define _GNU_SOURCE
+
 #include <sys/reboot.h>
 
 #include <fcntl.h>