see this: http://stackoverflow.com/questions/30892773/building-vtk-with-qt5-windows-8/30894401#30894401 change VK_QT_VERSION to 5 in your cmake -- View this message in context: http://vtk.1045678.n5.nabble.com/Configuring-VTK-with-Qt5-tp5732998p5732999.html Sent from the VTK - Users mailing list archive at Nabble.com.