From 169bd75678bec8605c48ba43cf81701bbe19c62c Mon Sep 17 00:00:00 2001
From: Marcel Holtmann <marcel@holtmann.org>
Date: Tue, 10 Feb 2026 16:47:30 +0100
Subject: [PATCH] eap-gtc: Fix build issue with missing _GNU_SOURCE
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  CC       src/eap-gtc.o
src/eap-gtc.c: In function ‘eap_gtc_free’:
src/eap-gtc.c:48:17: error: implicit declaration of function ‘explicit_bzero’ [-Wimplicit-function-declaration]
   48 |                 explicit_bzero(gtc->password, strlen(gtc->password));
      |                 ^~~~~~~~~~~~~~
---
 src/eap-gtc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/eap-gtc.c b/src/eap-gtc.c
index 4d2d67ab..80a857cb 100644
--- a/src/eap-gtc.c
+++ b/src/eap-gtc.c
@@ -24,8 +24,10 @@
 #include <config.h>
 #endif
 
+#define _GNU_SOURCE
 #include <stdio.h>
 #include <errno.h>
+#include <string.h>
 #include <ell/ell.h>
 
 #include "src/missing.h"