--- qtbase-opensource-src-5.6.0-rc/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp.orig	2016-02-15 11:27:10.714918086 +0100
+++ qtbase-opensource-src-5.6.0-rc/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp	2016-02-15 11:52:11.843978315 +0100
@@ -38,6 +38,7 @@
 #include "qtouchdevice.h"
 #include <qpa/qwindowsysteminterface.h>
 #include <QDebug>
+#include <cmath>
 
 #ifdef XCB_USE_XINPUT2