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bpo-41282: Fix broken make install #26327

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bpo-41282: Fix broken make install #26327

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3 changes: 3 additions & 0 deletions Lib/distutils/command/install.py
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Expand Up @@ -316,6 +316,9 @@ def finalize_options(self):
self.config_vars['userbase'] = self.install_userbase
self.config_vars['usersite'] = self.install_usersite

if sysconfig.is_python_build(True):
self.config_vars['srcdir'] = sysconfig.get_config_var('srcdir')

self.expand_basedirs()

self.dump_dirs("post-expand_basedirs()")
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6 changes: 6 additions & 0 deletions Lib/sysconfig.py
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Expand Up @@ -182,6 +182,12 @@ def is_python_build(check_home=False):

_PYTHON_BUILD = is_python_build(True)

if _PYTHON_BUILD:
for scheme in ('posix_prefix', 'posix_home'):
_INSTALL_SCHEMES[scheme]['include'] = '{srcdir}/Include'
_INSTALL_SCHEMES[scheme]['platinclude'] = '{projectbase}/.'


def _subst_vars(s, local_vars):
try:
return s.format(**local_vars)
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Build/2021-05-24-03-31-17.bpo-41282.L8nP44.rst
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@@ -0,0 +1,3 @@
Fix broken ``make install`` that caused standard library extension modules
to be unnecessarily and incorrectly rebuilt during the install phase of
cpython.