def get_macosx_target_ver_from_syscfg():
    """Get the version of macOS latched in the Python interpreter configuration.
    Returns the version as a string or None if can't obtain one. Cached."""
    global _syscfg_macosx_ver
    if _syscfg_macosx_ver is None:
        from distutils import sysconfig

        ver = sysconfig.get_config_var(MACOSX_VERSION_VAR) or ''
        if ver:
            _syscfg_macosx_ver = ver
    return _syscfg_macosx_ver
Get the version of macOS latched in the Python interpreter configuration.
    Returns the version as a string or None if can't obtain one. Cached.
product/gradle-plugin/src/main/python/setuptools/_distutils/util.py