media-sound/rosegarden-4.0.9.ebuild requires "virtual/gcc" in DEPEND. An emerge of it fails because it cannot find 'masked or unmasked ebuilds to satisfy "virtual/gcc"'. Replacing 'virtula' with 'sys-devel' seems to fix the problem. It is always reproduceable.
already fixed http://www.gentoo.org/cgi-bin/viewcvs.cgi/media-sound/rosegarden/rosegarden-4.0.9.ebuild.diff?r1=1.6&r2=1.7