Mine

myprecious mattias # emerge -1 $(<~/.revdep-rebuild.4_ebuilds)
dia-video/vlc-0.8.2-r2 www-client/mozilla-firefox-bin-1.0.8 www-client/opera-8.50Calculating dependencies

!!! 'app-cdr/k3b-0.12.14' is not a valid package atom.
!!! Please check ebuild(5) for full details.
!!! (Did you specify a version but forget to prefix with '='?)