[issue20848] 3.4 cherry-pick: b637064cc696 Improve enum subclass behavior

[Ethan Furman]

Ethan Furman added the comment:

For the past couple weeks everytime I try I get:

sphinx-build -b html -d build/doctrees -D latex_paper_size=  . build/html 
make: sphinx-build: Command not found
make: *** [build] Error 127

----------

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20848>
_______________________________________