openwrtv4/package/boot/uboot-envtools/patches/100-fw_env_gnu_source.patch

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--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -8,6 +8,7 @@
* SPDX-License-Identifier: GPL-2.0+
*/
+#define _GNU_SOURCE
#include <errno.h>
#include <env_flags.h>
#include <fcntl.h>