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-rw-r--r--peripheral/efivars.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/peripheral/efivars.c b/peripheral/efivars.c
index a86031fbd..3cc213c0c 100644
--- a/peripheral/efivars.c
+++ b/peripheral/efivars.c
@@ -25,6 +25,7 @@
#include <config.h>
#endif
+#define _GNU_SOURCE
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>