Complex sentence: The QT5 tool kit does not work with MicroXwin due to its use of XCB instead of Xlib and current XCB support in MicroXwin is not complete.
Split into simpler sentences: The QT5 tool kit does not work with MicroXwin at this time due to its use of XCB instead of Xlib. The current XCB support in MicroXwin is not complete.