Всем доброго времени!
Собственно сабж в последней строке выхлопа от ebuild'а:
The following keyword changes are necessary to proceed:
(see "package.accept_keywords" in the portage(5) man page for more details)
# required by app-office/openerp-7.0.20140125
# required by app-office/openerp (argument)
=dev-python/python-openid-2.2.5-r1 ~x86
...
...
Would you like to add these changes to your config files? [Yes/No]