dnsdist-1.6.x: Backport a missing mutex header

diff --git a/pdns/lock.hh b/pdns/lock.hh
index 09299d7979de51cd6bee4a7289315311022b5f6f..0e88118c564328cdfedefa3e3f3a1ab45f6e85f6 100644 (file)
--- 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