Please update sources.gentoo.org to www-apps/viewvc-1.0.4. Now sources.gentoo.org website uses obsolete www-apps/viewcvs-1.0_pre20050929. (ViewCVS was renamed to ViewVC long time ago.)
viewvc 1.0.5 was released as a security update, see bug 212288.
sources.g.o should have all of the patches custom-applied, as there are lots of other changes as well. If you see a bug that still exists, please inform me privately.