--- room.cpp.old	2016-07-15 20:51:40.885423667 -0700
+++ room.cpp	2016-07-15 20:51:50.536913667 -0700
@@ -2,6 +2,7 @@
 
 #include <algorithm>
 #include <climits>
+#include <numeric>
 
 #include "init.hpp"
 #include "map.hpp"