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-rw-r--r--tools/bpf/bpftool/net.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/net.c b/tools/bpf/bpftool/net.c
index 526a332c48e6..c40e44c938ae 100644
--- a/tools/bpf/bpftool/net.c
+++ b/tools/bpf/bpftool/net.c
@@ -1,7 +1,9 @@
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
// Copyright (C) 2018 Facebook
+#ifndef _GNU_SOURCE
#define _GNU_SOURCE
+#endif
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>