Hi,

seems I broke Qt 5 in my main profile by updating some packages.

I've got this situation:

/gnu/store/gdcnj399zhkpa5kf2mnzgg9lfb3nnd0h-lyx-2.2.3$ gdb share/lyx/bin/lyx2.2
(gdb) r
Cannot mix incompatible Qt library (version 0x50903) with this library (version 0x50904)
Aborted
(gdb) bt
#0  0x00007ffff50a41e4 in raise () from /gnu/store/4sqaib7c2dfjv62ivrg9b8wa7bh226la-glibc-2.26.105-g0890d5379c/lib/libc.so.6
#1  0x00007ffff50a55e5 in abort () from /gnu/store/4sqaib7c2dfjv62ivrg9b8wa7bh226la-glibc-2.26.105-g0890d5379c/lib/libc.so.6
#2  0x00007ffff61c5f0e in QMessageLogger::fatal(char const*, ...) const () from /gnu/store/rr0225gz6qb1j9xwc5iinf1143dg6cw6-qtbase-5.9.4/lib/libQt5Core.so.5
#3  0x00007ffff63c5301 in QObjectPrivate::QObjectPrivate(int) () from /gnu/store/rr0225gz6qb1j9xwc5iinf1143dg6cw6-qtbase-5.9.4/lib/libQt5Core.so.5
#4  0x00007fffedaae100 in ?? () from /gnu/store/4if0il1fssgh3zna4b3x9lwbgw49z01m-qtbase-5.9.3/lib/qt5/plugins/platforms/../../../libQt5DBus.so.5
#5  0x00007fffedaaeed4 in QDBusAbstractInterface::QDBusAbstractInterface(QString const&, QString const&, char const*, QDBusConnection const&, QObject*) () from /gnu/store/4if0il1fssgh3zna4b3x9lwbgw49z01m-qtbase-5.9.3/lib/qt5/plugins/platforms/../../../libQt5DBus.so.5
#6  0x00007fffeda98759 in QDBusConnectionInterface::QDBusConnectionInterface(QDBusConnection const&, QObject*) () from /gnu/store/4if0il1fssgh3zna4b3x9lwbgw49z01m-qtbase-5.9.3/lib/qt5/plugins/platforms/../../../libQt5DBus.so.5
#7  0x00007fffeda94d18 in ?? () from /gnu/store/4if0il1fssgh3zna4b3x9lwbgw49z01m-qtbase-5.9.3/lib/qt5/plugins/platforms/../../../libQt5DBus.so.5
#8  0x00007fffeda9552d in ?? () from /gnu/store/4if0il1fssgh3zna4b3x9lwbgw49z01m-qtbase-5.9.3/lib/qt5/plugins/platforms/../../../libQt5DBus.so.5
#9  0x00007ffff63c88f1 in QObject::event(QEvent*) () from /gnu/store/rr0225gz6qb1j9xwc5iinf1143dg6cw6-qtbase-5.9.4/lib/libQt5Core.so.5
#10 0x00007ffff639dc63 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /gnu/store/rr0225gz6qb1j9xwc5iinf1143dg6cw6-qtbase-5.9.4/lib/libQt5Core.so.5
#11 0x00007ffff63a030b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /gnu/store/rr0225gz6qb1j9xwc5iinf1143dg6cw6-qtbase-5.9.4/lib/libQt5Core.so.5
#12 0x00007ffff63f0583 in ?? () from /gnu/store/rr0225gz6qb1j9xwc5iinf1143dg6cw6-qtbase-5.9.4/lib/libQt5Core.so.5
#13 0x00007ffff17cd5c7 in g_main_context_dispatch () from /gnu/store/i1x64fz6m3i1l61vywn5bgdamw0h71c0-glib-2.54.2/lib/libglib-2.0.so.0
#14 0x00007ffff17cd808 in g_main_context_iterate.isra () from /gnu/store/i1x64fz6m3i1l61vywn5bgdamw0h71c0-glib-2.54.2/lib/libglib-2.0.so.0
#15 0x00007ffff17cd8ac in g_main_context_iteration () from /gnu/store/i1x64fz6m3i1l61vywn5bgdamw0h71c0-glib-2.54.2/lib/libglib-2.0.so.0
#16 0x00007ffff63efbcf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /gnu/store/rr0225gz6qb1j9xwc5iinf1143dg6cw6-qtbase-5.9.4/lib/libQt5Core.so.5
#17 0x00007ffff639c25a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /gnu/store/rr0225gz6qb1j9xwc5iinf1143dg6cw6-qtbase-5.9.4/lib/libQt5Core.so.5
#18 0x00007ffff61d819c in QThread::exec() () from /gnu/store/rr0225gz6qb1j9xwc5iinf1143dg6cw6-qtbase-5.9.4/lib/libQt5Core.so.5
#19 0x00007fffeda939d5 in ?? () from /gnu/store/4if0il1fssgh3zna4b3x9lwbgw49z01m-qtbase-5.9.3/lib/qt5/plugins/platforms/../../../libQt5DBus.so.5
#20 0x00007ffff61dcd6a in ?? () from /gnu/store/rr0225gz6qb1j9xwc5iinf1143dg6cw6-qtbase-5.9.4/lib/libQt5Core.so.5
#21 0x00007ffff4e594d5 in start_thread () from /gnu/store/4sqaib7c2dfjv62ivrg9b8wa7bh226la-glibc-2.26.105-g0890d5379c/lib/libpthread.so.0
#22 0x00007ffff51602cf in clone () from /gnu/store/4sqaib7c2dfjv62ivrg9b8wa7bh226la-glibc-2.26.105-g0890d5379c/lib/libc.so.6

So it's apparently Qt DBus related since the version of Qt DBus is 5.9.3 but the other Qt stuff is 5.9.4.

If I unset QT_PLUGIN_PATH, it works.

QT_PLUGIN_PATH was:

$HOME/.guix-profile/lib/qt5/plugins