gtkmm4: gtkmm4 (C++ interface for GTK4) gtkmm4: gtkmm4: gtkmm4 is the official C++ interface for the popular GUI library gtkmm4: GTK4. Highlights include typesafe callbacks, and a comprehensive set gtkmm4: of widgets that are easily extensible via inheritance. gtkmm4: gtkmm4: Homepage: http://www.gtkmm.org/ gtkmm4: gtkmm4: gtkmm4: gtkmm4: