def get_config_h_filename():
    """Return full pathname of installed pyconfig.h file."""
    if python_build:
        if os.name == "nt":
            inc_dir = os.path.join(_sys_home or project_base, "PC")
        else:
            inc_dir = _sys_home or project_base
        return os.path.join(inc_dir, 'pyconfig.h')
    else:
        return sysconfig.get_config_h_filename()
Return full pathname of installed pyconfig.h file.
product/gradle-plugin/src/main/python/setuptools/_distutils/sysconfig.py