Please see attached, I have contributed ebuilds for CVSfile and it's dependancy ExternalFile (different to extfile). This allows Zope projects to be hosted in a CVS repository.
Created attachment 27180 [details] Ebuild for net-zope/externalfile
Created attachment 27181 [details] Ebuild for net-zope/cvsfile
thanks for your contribution. ebuild integrated to portage.