$OpenBSD: patch-src_tile_cc,v 1.1 2017/05/03 18:10:07 jca Exp $
--- src/tile.cc.orig
+++ src/tile.cc
@@ -4,6 +4,7 @@
 #include "tile.h"
 #include <algorithm>
 #include <stack>
+#include <cstdlib>
 //#include <stdio.h>
 
 /* 
