Amarok could not find any sound-engine plugins. Amarok is now updating the KDE configuration database. Please wait a couple of minutes, then restart Amarok.
If this does not help, it is likely that Amarok is installed under the wrong prefix, please fix your installation using:
$ cd /path/to/amarok/source-code/
$ su -c "make uninstall"
$ ./configure --prefix=`kde-config --prefix` && su -c "make install"
$ kbuildsycoca
$ amarok
More information can be found in the README file. For further assistance join us at #amarok on irc.freenode.net.

---- Console output -----
dameon@gentoo ~ $ amarok
Amarok: [Loader] Starting amarokapp..
Amarok: [Loader] Don't run gdb, valgrind, etc. against this binary! Use amarokapp.
kio (KMimeType): WARNING: KServiceType::offers : servicetype Amarok/Plugin not found
kio (KMimeType): WARNING: KServiceType::offers : servicetype Amarok/Plugin not found
kbuildsycoca running...
Reusing existing ksycoca
kio (KSycoca): ERROR: No database available!
kbuildsycoca: WARNING: '/usr/share/applications/kde/amarok.desktop' specifies undefined mimetype/servicetype 'application/asx'
kbuildsycoca: WARNING: '/usr/share/applications/kde/amarok.desktop' specifies undefined mimetype/servicetype 'audio/midi'
kbuildsycoca: WARNING: '/usr/share/applications/kde/amarok.desktop' specifies undefined mimetype/servicetype 'audio/x-aac'
kbuildsycoca: WARNING: '/usr/share/applications/kde/amarok.desktop' specifies undefined mimetype/servicetype 'audio/x-m4a'
kbuildsycoca: WARNING: '/usr/share/applications/kde/konversation.desktop' specifies undefined mimetype/servicetype 'DCOP/InstantMessenger;DCOP/Unique'
kbuildsycoca: WARNING: 'kcertpart.desktop' specifies undefined mimetype/servicetype 'application/binary-certificate'
kbuildsycoca: WARNING: 'katepart.desktop' specifies undefined mimetype/servicetype 'text/x-fortran'
kbuildsycoca: WARNING: 'knotify.desktop' specifies undefined mimetype/servicetype 'KNotify'