+
+#if QT_VERSION > QT_VERSION_CHECK(5, 0, 0)
+ // initialization of the X11 visual on Linux
+ QSurfaceFormat format;
+ format.setDepthBufferSize(16);
+ format.setStencilBufferSize(1);
+ format.setProfile(QSurfaceFormat::CompatibilityProfile);
+ QSurfaceFormat::setDefaultFormat(format);
+#endif