[issue41116] build on macOS 11 (beta) does not find system-supplied third-party libraries

[Sijmen J. Mulder]

Sijmen J. Mulder <ik at sjmulder.nl> added the comment:

With './configure; make' of master on macOS 11 on Apple Silicon I get the library detection failure. The quick and easy fix was to amend inc_dirs and lib_dirs in setup.py:

         if MACOS:
+            sysroot = macosx_sdk_root()
+            self.inc_dirs.append(sysroot + '/usr/include')
+            self.lib_dirs.append(sysroot + '/usr/lib')

Interestingly the lzma library is found, but the module fails because it cannot find lzma.h, which does indeed appear to be missing in the SDK.

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nosy: +sjmulder

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41116>
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