def get_requires_for_build_wheel(config_settings):
    """Invoke the optional get_requires_for_build_wheel hook

    Returns [] if the hook is not defined.
    """
    backend = _build_backend()
    try:
        hook = backend.get_requires_for_build_wheel
    except AttributeError:
        return []
    else:
        return hook(config_settings)
Invoke the optional get_requires_for_build_wheel hook

    Returns [] if the hook is not defined.
    
stackoverflow/venv/lib/python3.6/site-packages/pip-19.0.3-py3.6.egg/pip/_vendor/pep517/_in_process.py