On 2016-11-03 20:40, Paul Masson wrote:
OSError: [Errno 2] No such file or directory:
'/Users/Masson/Downloads/GitHub/sage/local/lib/python2.7/site-packages/backports_abc-0.4-py2.7.egg'
Error installing Cython

This looks very much like
https://trac.sagemath.org/ticket/21672
which should be fixed in Sage 7.4

Can you please *double-check* that you are really running a pristine copy of Sage 7.4?

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