I'm posting an ebuild for zope 2.6.4_rc2 devel version Reproducible: Always Steps to Reproduce:
Created attachment 25421 [details] ebuild for zope 2.6.4_rc2 test it, maybe some tuning is needed, but it works fine for me
i will wait for 2.6.4 final to commit, rc1 which fixes the serious bugs from 2.6.3 is already in portage and it can't be long until 2.6.4 final is released (maybe rc2 will be final)