--- opencv-3.1.0.orig/modules/highgui/src/window_QT.cpp 2015-12-18 16:02:16.000000000 +0100 +++ opencv-3.1.0/modules/highgui/src/window_QT.cpp 2016-02-26 22:31:37.004570651 +0100 @@ -3165,7 +3165,9 @@ void OpenGlViewPort::initializeGL() { +#ifdef GL_PERSPECTIVE_CORRECTION_HINT glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); +#endif } void OpenGlViewPort::resizeGL(int w, int h)