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Apply Debian-specific patches to distutils commands.
Extracts the customized behavior from patches as reported
in pypa/distutils#2 and applies those customizations (except
for scheme definitions) to those commands.
Place this module somewhere in sys.path to take effect.
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Given a scheme name and the resolved scheme,
if the scheme does not include headers, resolve
the fallback scheme for the name and use headers
from it. pypa/distutils#88
headers: module headers install location (posix_local is /local/ prefixed)
include: cpython headers (Python.h)
See also: bpo-44445
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Implement the _inject_headers modification, above, but before
_inject_headers() was introduced, upstream. So, slower and messier.
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Ensure that the custom schemes we refer to above are present in schemes.
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