qt Enable EGL integration Build the EGL Full Screen/Single Surface platform plugin Enable support for input devices via evdev 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 integration with the dev-libs/glib event loop Build the GTK platform theme plugin Build a widgets style that mimics the active GTK+ theme Use media-libs/harfbuzz for text shaping Build the IBus input method plugin Enable support for input devices via dev-libs/libinput 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. Enable support for touchscreen devices via x11-libs/tslib Build plugin to receive touch events over the TUIO protocol Build the XCB platform plugin and enable X11 integration https://bugreports.qt.io/ http://doc.qt.io/