1.) When I install kdewebdev-6:3.5.10-21.fc20 (x86_64):

Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : 6:kdewebdev-3.5.10-21.fc20.x86_64                                                                 1/1 
warning: %post(kdewebdev-6:3.5.10-21.fc20.x86_64) scriptlet failed, exit status 127
Non-fatal POSTIN scriptlet failure in rpm package 6:kdewebdev-3.5.10-21.fc20.x86_64
warning: %posttrans(kdewebdev-6:3.5.10-21.fc20.x86_64) scriptlet failed, exit status 127
Non-fatal POSTTRANS scriptlet failure in rpm package 6:kdewebdev-3.5.10-21.fc20.x86_64
  Verifying  : 6:kdewebdev-3.5.10-21.fc20.x86_64                                                                 1/1 

Installed:
  kdewebdev.x86_64 6:3.5.10-21.fc20



2.) When starting quanta:
$ quanta
quanta: error while loading shared libraries: libqt-mt.so.3: cannot open shared object file: No such file or directory



3.) "yum provides libqt-mt.so.3" gives me: qt3-3.3.8b-53.fc20.i686



4.) "yum reinstall qt3" gives me:
...
...
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : qt3-3.3.8b-53.fc20.x86_64                                                                         1/1 
warning: %post(qt3-3.3.8b-53.fc20.x86_64) scriptlet failed, exit status 127
Non-fatal POSTIN scriptlet failure in rpm package qt3-3.3.8b-53.fc20.x86_64
  Verifying  : qt3-3.3.8b-53.fc20.x86_64                                                                         1/1 

Installed:
  qt3.x86_64 0:3.3.8b-53.fc20                                                                                        

Complete!