bug 329529 caused quite a mess, let's avoid that in the future?
Sebastian (few on irc) had a patch baked for this. Waiting for portage maintainers to commit to HEAD.
This is in git now: http://git.overlays.gentoo.org/gitweb/?p=proj/portage.git;a=commit;h=b583812101f1156c553385effcd9dbee0b751087
portage with this check released in Prefix tree: RepoMan scours the neighborhood... eprefixify.defined 1 net-misc/whois/whois-5.0.6.ebuild: prefix.eclass is not inherited, but eprefixify is used on line: 35 Thanks guys