perseo root # emerge -n '>=sys-apps/portage-2.0.51'
!!! 'str' object has no attribute 'insert'
!!! 'rm -Rf /usr/portage/profiles; emerge sync' may fix this. If it does
!!! not then please report this to bugs.gentoo.org and, if possible, a dev
!!! on #gentoo (irc.freenode.org)
perseo root #