--- spring_100.0/rts/Game/Camera.cpp.orig	2016-01-29 00:37:33.381159185 +0000
+++ spring_100.0/rts/Game/Camera.cpp	2016-01-29 00:40:23.032599057 +0000
@@ -1,6 +1,7 @@
 /* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
 
 #include <string.h>
+#include <cmath>  // for std::abs(float)
 
 #include "Camera.h"
 #include "UI/MouseHandler.h"