From 12e65dc02520665dd16137534c4d93fb159b7a48 Mon Sep 17 00:00:00 2001
From: Marcel Holtmann <marcel@holtmann.org>
Date: Tue, 10 Feb 2026 17:10:16 +0100
Subject: [PATCH] netdev: Fix build issue with missing _GNU_SOURCE
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  CC       src/netdev.o
src/netdev.c: In function ‘pae_open’:
src/netdev.c:6606:40: error: ‘SO_ATTACH_FILTER’ undeclared (first use in this function)
 6606 |         if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER,
      |                                        ^~~~~~~~~~~~~~~~
src/netdev.c:6606:40: note: each undeclared identifier is reported only once for each function it appears in
---
 src/netdev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/netdev.c b/src/netdev.c
index cdb3f1d7..e639a1f8 100644
--- a/src/netdev.c
+++ b/src/netdev.c
@@ -24,6 +24,7 @@
 #include <config.h>
 #endif
 
+#define _GNU_SOURCE
 #include <stdlib.h>
 #include <alloca.h>
 #include <stdio.h>
@@ -32,8 +33,8 @@
 #include <linux/if.h>
 #include <linux/if_packet.h>
 #include <linux/if_ether.h>
-#include <arpa/inet.h>
 #include <linux/filter.h>
+#include <arpa/inet.h>
 #include <sys/socket.h>
 #include <errno.h>