--with-roseQt(depends on Qt4.5)
--with-dwarf(to use the AsmToSourceMapper)
cp roseInstallDir/lib/libQtDesignerPlugins.so \ qtinstallpath/qtplugins/designer/
The default Qt-Plugin path is QtInstallationFolder/qtplugins . If you do not have write access to that, it's possible to create a new one and set the environment variable QT_PLUGIN_PATH accordingly.
Important: the env-variable has to point to the qtplugins folder not to the designer folder.