Created attachment 199743 [details]
patch SITELIBDIR for @py36
In the process of preparing my new port graphics/qgis with QGIS 3, I found graphics/py-gdal as a showstopper, because it is not able to install for flavor @py36.
I think, this is because graphics/py-gdal@py37 tries to install the Python files wrongly in PYTHON_SITELIBDIR instead of PYTHONPREFIX_SITELIBDIR.
The attached patch seems to solve the problem, now both @py27 and @py36 are installable at the same time.
Tested with Poudriere (F11.2i/a, F12.0-RC1i/a, and HEADi/a).
'portlint -AC' seems fine.
I cannot reproduce the problem.
And our building cluster generates the packages successfully .