dev-python/sphinx fails to build for Python3.4 unless one re-emerges dev-python/jinja which builds jinja for Python3.4, as well.
+ 07 May 2014; Mike Gilbert <floppym@gentoo.org> sphinx-1.2.2.ebuild: + Update python_gen_usedep for dev-python/jinja, bug 509780 by Helmut Jarausch.