The issue here is that KApplicationPrivate::init() (from kdelibs4support) has this call: XInternAtoms(QX11Info::display(), names, n, false, atoms_return); However QX11Info::display() behavior changed in Qt 5.5 [1], and it returns a null pointer when ran with old qtbase (5.4), therefore XInternAtoms crashes. So the only thing we can do here is tightening the qtx11extras dependencies to make sure it will pull in libqt5gui5 5.5 (which I will do now). [1]: http://code.qt.io/cgit/qt/qtx11extras.git/commit/?id=e6a813c7869fb367 -- Dmitry Shachnev
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