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-rw-r--r--tools/bpf/bpftool/prog.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index 10ec29cb4598..dbf5489b8fde 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -1,7 +1,9 @@
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2017-2018 Netronome Systems, Inc. */
+#ifndef _GNU_SOURCE
#define _GNU_SOURCE
+#endif
#include <errno.h>
#include <fcntl.h>
#include <signal.h>