Need to figure out why it tries to build docs using py3.
Created attachment 396512 [details] Build log (.lz) I can reproduce unhappily ;).
https://github.com/aliceinwire/overlay/tree/master/dev-python/pypy i added a try to patch about your problem. please try installing from the overlay. I cannot reproduce on my machine but anyway try to compile now with USE="doc" and see what happen.
FWICS, sphinx is now called via the correct Python.
*** Bug 547002 has been marked as a duplicate of this bug. ***
*** This bug has been marked as a duplicate of bug 483166 ***