Qt5Gtk2 - GTK+2.0 integration plugins for Qt5 Official home page: https://github.com/trialuser02/qt5gtk2 Requirements: - GNU Linux or FreeBSD - qtbase >= 5.7.0 (with private headers) - GTK+ 2.0 - libX11 Installation: qmake make make install (under root) To change default installation root you should run the following command: make install INSTALL_ROOT="custom root" Add line 'export QT_QPA_PLATFORMTHEME=qt5gtk2' to ~/.profile and re-login. Alternatively, create the file /etc/X11/Xsession.d/100-qt5gtk2 with the following line: export QT_QPA_PLATFORMTHEME=qt5gtk2 (qt6gtk2 for compatibility with Qt5Gtk2) Now restart X11 server to take the changes effect. Files and directories: libqt5gtk2.so - GTK+2.0 platform plugin libqt5gtk2-style.so - GTK+2.0 style plugin Attention! Environment variable QT_STYLE_OVERRIDE should be removed before usage.