{vis}[GCCcore/6.4.0] X11 v20171023

[boegel]

(created using eb --new-pr)

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 2 out of 2 (2 easyconfigs in this PR)
gligar03.gligar.os - Linux centos linux 7.4.1708, Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz, Python 2.7.5
See https://gist.github.com/d144e0538be271597a183a150728cdd3 for a full test report.

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 2 out of 2 (2 easyconfigs in this PR)
node2609.swalot.os - Linux centos linux 7.4.1708, Intel(R) Xeon(R) CPU E5-2660 v3 @ 2.60GHz, Python 2.7.5
See https://gist.github.com/edf70400915957da3ed2c06d66957378 for a full test report.

[boegel]

@easybuilders/easybuild-easyconfigs-maintainers I've purposely removed the allow_system_deps for Python and dropped lib/python%s/site-packages/xcbgen from the sanity check.

Since $PYTHONPATH was not being updated, it's clear that the xcbgen Python bindings have been irrelevant up until now, so I feel this makes sense.

This also relates to the discussion in #4979.