The shared libraries in kdelibs3 have an incompatible build key with other parts of the qt3 ecosystem. I have already tried a newer, not yet pushed build from koji: <http://koji.fedoraproject.org/koji/buildinfo?buildID=626182> The error message (just for one .so, they are all the same) when starting qtconfig is: Conflict in /usr/lib64/kde3/plugins/styles/highcolor.so: Plugin uses incompatible Qt library! expected build key "x86_64 Linux g++-5.0.1 20150413 (Red Hat 5.0.1-0.1) 2015 Free Software Foundation, Inc. full-config", got "x86_64 Linux g++-5.0.0 20150217 (Red Hat 5.0.0-0.15) 2015 Free Software Foundation, Inc. full-config".
Looks like Qt 3 needs fixing for GCC 5. :-( I'm looking into it.
The underlying cause should be fixed in qt3-3.3.8b-64.fc22 and qt3-3.3.8b-64.fc23, but at least kdelibs3 (and anything else that was built against the faulty qt3 builds) will need to be rebuilt, too.
The current stable kdelibs3-3.5.10-65.fc22 should work again with qt3-3.3.8b-64.fc22. kdelibs3-3.5.10-66.fc22 is broken, I'm untagging it from updates-candidate. I'll rebuild kdelibs3 again.
In F22, that's probably as far as the damage went. But in Rawhide, it looks like pretty much the whole stack will need to be rebuilt, because kalev rebuilt a bunch of Qt-3-based packages in February.
qt3-3.3.8b-64.fc22 has been submitted as an update for Fedora 22. https://admin.fedoraproject.org/updates/qt3-3.3.8b-64.fc22
> kalev rebuilt a bunch of Qt-3-based packages in February. Right now in May, actually.
kdelibs3-3.5.10-68.fc22 and kdelibs3-3.5.10-68.fc23 now also built.
I have upgraded to qt3-3.3.8b-64.fc22 and kdelibs3-3.5.10-68.fc22 (from koji) and can confirm that the bug is fixed in Fedora 22. Thanks!
Package qt3-3.3.8b-64.fc22, kdelibs3-3.5.10-68.fc22: * should fix your issue, * was pushed to the Fedora 22 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing qt3-3.3.8b-64.fc22 kdelibs3-3.5.10-68.fc22' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2015-7670/qt3-3.3.8b-64.fc22,kdelibs3-3.5.10-68.fc22 then log in and leave karma (feedback).
This update was pushed to stable 7 months ago, 2015-05-11 04:07:03.