On 2016-10-11 09:38, Eric Gourgoulhon wrote:
[sagelib-7.4.rc0] sage/rings/finite_rings/integer_mod.pyx:1688:10: '_floordiv_' 
already defined

It seems that this machine is running the Sage patchbot within a Sage shell, which is not supported. Because of this, the environment variable PIP_INSTALL is set to a wrong value, so the fix from #21441 is not applied.

In logs/install.log there is

*** ALL ENVIRONMENT VARIABLES BEFORE BUILD: ***
...
SAGE_ENV_SOURCED=4
...

This shouldn't be there. Whether you are using the patchbot or not, you should not build Sage within a Sage shell.

Concrete suggestions:

1. Stop this patchbot

2. Rebuild Python (./sage -f python2)

3. Run the patchbot properly, see https://wiki.sagemath.org/buildbot/details

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