From 88d2718b507c95ca8f78e85eabf4eba1ff4d2c29 Mon Sep 17 00:00:00 2001
From: Marcel Holtmann <marcel@holtmann.org>
Date: Tue, 10 Feb 2026 09:19:56 +0100
Subject: [PATCH] netconfig: Fix build issue with missing _GNU_SOURCE
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  CC       src/netconfig.o
src/netconfig.c: In function ‘netconfig_load_settings’:
src/netconfig.c:290:23: error: ‘HOST_NAME_MAX’ undeclared (first use in this function); did you mean ‘XATTR_NAME_MAX’?
  290 |         char hostname[HOST_NAME_MAX + 1];
      |                       ^~~~~~~~~~~~~
      |                       XATTR_NAME_MAX
src/netconfig.c:290:23: note: each undeclared identifier is reported only once for each function it appears in
src/netconfig.c:388:30: error: implicit declaration of function ‘gethostname’; did you mean ‘getsockname’? [-Wimplicit-function-declaration]
  388 |         if (send_hostname && gethostname(hostname, sizeof(hostname)) != 0) {
      |                              ^~~~~~~~~~~
      |                              getsockname
src/netconfig.c:290:14: error: unused variable ‘hostname’ [-Werror=unused-variable]
  290 |         char hostname[HOST_NAME_MAX + 1];
      |              ^~~~~~~~
---
 src/netconfig.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/netconfig.c b/src/netconfig.c
index cd19217c..4e62b1dc 100644
--- a/src/netconfig.c
+++ b/src/netconfig.c
@@ -24,6 +24,7 @@
 #include <config.h>
 #endif
 
+#define _GNU_SOURCE
 #include <errno.h>
 #include <arpa/inet.h>
 #include <net/if_arp.h>
@@ -31,6 +32,7 @@
 #include <limits.h>
 #include <string.h>
 #include <fcntl.h>
+#include <sys/param.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>