Returns-->dict: to be assigned to setuptools.setup
                    cmdclass param

def get_cmdclass():
    '''
    Returns-->dict: to be assigned to setuptools.setup
                    cmdclass param
    '''
    ret = {}
    cfg = __get_config()
    if cfg is None:
        return
    mapdict = {
        'build': CustomBuild,
        'build_clib': CustomBuildCLib,
        'build_ext': CustomBuildExt,
        'build_py': CustomBuildPy,
        'build_scripts': CustomBuildScripts,
        'install': CustomInstall,
        'install_data': CustomInstallData,
        'install_headers': CustomInstallHeaders,
        'install_lib': CustomInstallLib,
        'install_scripts': CustomInstallScripts,
    }
    for step in cfg.keys():
        if step in mapdict:
            ret[step] = mapdict[step]
    return ret