Created attachment 535404 [details] emerge --info output My qtwidgets-5.9.5 are built with USE="gtk". However, if I try to start any qt application with GTK style, I get the above message. To reproduce emerge qtwidgets-5.9.5 with USE="gtk" and run: fbreader -style=gtk QApplication: invalid style override passed, ignoring it. or export QT_STYLE_OVERRIDE=gtk fbreader QApplication: invalid style override passed, ignoring it.