My app checks in code if trayIcon.Hint is working. Therefor I have to distinguish in my code if the application has LCLWidgetType=qt5 or LCLWidgetType=gtk2 The solution for gtk2 is: > getEnvironmentVariable('LAZUSEAPPIND') I couldn't google a check for LCLWidgetType=qt5, how to do that? Tipps are welcome ....