$OpenBSD: patch-src_game_h,v 1.1 2017/04/30 08:56:45 espie Exp $
--- src/game.h.orig
+++ src/game.h
@@ -212,7 +212,7 @@ class game (protected)
 
 	class simulate_worker : public thread
 	{
-		mutex mtx;
+		dd::mutex mtx;
 		condvar cond;
 		condvar condfini;
 		game& gm;
