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This allows pip install --user to install headers in ~/.local/include, instead of trying to install them in /usr/include and fail with "permission denied" error.
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Fixes
pip install --userfailing with "permission denied" error when trying to copy headers (data_files) into destination place.What failed before:
pip install --usercopies all Python files correctly to~/.local/lib/python3.5/site-packages/, but then tries to copy C headers to absolute path pointed bysys.exec_prefix- which still points to system-global directory when installing with--user.The fix: use relative paths,
setup()will take care of them properly.For reference: https://docs.python.org/3/distutils/setupscript.html#installing-additional-files
Also, I needed to manually apply patches from #120 to make it build at all, but for the purpose of PR, I rebased them to master.