From 65bb0ab32a449d8fb8cf9a4802d16ba4912d9fc4 Mon Sep 17 00:00:00 2001
From: Remi Gacogne <remi.gacogne@powerdns.com>
Date: Tue, 25 May 2021 10:09:43 +0200
Subject: [PATCH] dnsdist-1.6.x: Backport a missing mutex header

---
 pdns/lock.hh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pdns/lock.hh b/pdns/lock.hh
index 09299d7979..0e88118c56 100644
--- a/pdns/lock.hh
+++ b/pdns/lock.hh
@@ -20,6 +20,8 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 #pragma once
+
+#include <mutex>
 #include <shared_mutex>
 
 class ReadWriteLock
-- 
2.47.2