qt Use EGL instead of default GLX to manage OpenGL contexts Compile EGL Full Screen/Single Surface support Enable evdev input support Add support for exceptions - like catching them inside the event loop (recommended by upstream) Use GLES 2.0 or later instead of full OpenGL Enable dev-libs/glib eventloop support Build a Qt style called GTK+ that mimics the active GTK+ theme Use media-libs/harfbuzz for text shaping Build the IBus input method plugin Enable the Qt3Support libraries for Qt4. Note that this does not mean you can compile pure Qt3 programs with Qt4. Build the 'trace' graphicssystem engine which allows to record all drawing operations into a trace buffer. The trace can be replayed later with the qttracereplay tool. https://bugreports.qt.io/ http://doc.qt.io/