--- src/state/LobbyStates.h.orig	2018-04-08 17:21:16.726380966 +0100
+++ src/state/LobbyStates.h	2018-04-08 17:22:18.917134737 +0100
@@ -2,6 +2,7 @@
 #define LOBBYSTATES_H_INCLUDED
 
 #include <boost/shared_ptr.hpp>
+#include <vector>
 #include "NetworkMessage.h"
 #include "PlayerIdentity.h"
 #include "State.h"