Normal，You will encounter this error when installing a Python package，This package must be a package containing C ++ code。
This is due to incompatibility after macOS update，In General，The maintainer of this package should already be compatible with this particular situation：
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if platform.system() == 'Darwin': extra_compile_args += ['-mmacosx-version-min=10.7', '-stdlib=libc++'] |
So on macOS[……]