https://github.com/openssl/openssl/pull/18719

From 7f58de577c05ae0bbd20eee9b2971cfa1cd062c8 Mon Sep 17 00:00:00 2001
From: Gregor Jasny <gjasny@googlemail.com>
Date: Tue, 5 Jul 2022 12:57:06 +0200
Subject: [PATCH] Add missing header for memcmp

CLA: trivial
---
 test/v3ext.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/v3ext.c b/test/v3ext.c
index 926f3884b138..a8ab64b2714b 100644
--- a/test/v3ext.c
+++ b/test/v3ext.c
@@ -8,6 +8,7 @@
  */
 
 #include <stdio.h>
+#include <string.h>
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/pem.h>