x11-plugins/karamba-tuxbar-0.17g RDEPENDs on >=x11-misc/superkaramba-0.21. I would expect this package to work just as well using kde-base/superkaramba. If this is the case, it would be nice to make it an || dependency on any of the two, to avoid blocks if kde-meta is emerged as well.
see http://comments.gmane.org/gmane.linux.gentoo.devel/36620