QtCreator 5.0.1 on openSUSE 12.3RC1: error plugin loader

[rolandqt]

QtCreater want to load some plugin at startup.

the 'Help' plugin fails with message:
.../Qt5.0.1/Tools/QtCreator/lib/qtcreator/plugins/QtProject/libHelp.so: Cannot load library .../Qt5.0.1/Tools/QtCreator/lib/qtcreator/plugins/QtProject/libHelp.so: (libpng12.s.0: cannot openshared object file: No such file or directory)

Nevertheless, the IDE runs.

[rolandqt]

installing an additional rpm helps:

zypper in libpng12-0