def configuration(parent_package='', top_path=None):
    from numpy.distutils.misc_util import Configuration
    config = Configuration('externals', parent_package, top_path)
    config.add_subpackage('nistats')

return config

def configuration(parent_package='', top_path=None):
    from numpy.distutils.misc_util import Configuration
    config = Configuration('externals', parent_package, top_path)
    config.add_subpackage('nistats')

    return config

fix externals setup