As per summary.
there is a new version of stepmania, http://code.google.com/p/sm-ssc/downloads/list the ebuild is marked for removal :( #Michael Sterrett <mr_bones_@gentoo.org> (17 Oct 2011) # Masked for removal on 20111116 # https://bugs.gentoo.org/show_bug.cgi?id=295776 # https://bugs.gentoo.org/show_bug.cgi?id=308375 # https://bugs.gentoo.org/show_bug.cgi?id=383101 but there is an upgrade
The package has been removed: http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/games-arcade/stepmania/