[2.7] bpo-19960: Fix building of zlib on macOS without installed headers #14257
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When building 2.7 on macOS without system header files installed in ``/usr/include``, a few extension modules dependent on system-supplied third-party libraries were not being built, most notably zlib. This situation arose in the past when building without the Command Line Tools and the option to install header files in the traditional system locations (like /usr/include). As of macOS 10.14, the header files are only available in an SDK so the problem addressed here affects most 2.7 builds.
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When building 2.7 on macOS without system header files installed in
/usr/include, a few extension modules dependent on system-suppliedthird-party libraries were not being built, most notably zlib.
This situation arose in the past when building without the Command
Line Tools and the option to install header files in the traditional
system locations (like
/usr/include). As of macOS 10.14, theheader files are only available in an SDK so the problem addressed
here affects most 2.7 builds.
https://bugs.python.org/issue19960
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