def tox_configure(config):
    """
    For more info, see: https://tox.readthedocs.io/en/latest/plugins.html
    For an example, see: https://github.com/tox-dev/tox-travis
    """
    sections = config._cfg.sections

    # Cache these
    make_envconfig = None
    reader = None

    # Default to false so:
    # 1. we don't affect other projects using tox
    # 2. check migrations can happen gradually
    if str(sections.get('testenv', {}).get(STYLE_FLAG, 'false')).lower() == 'true':
        # Disable flake8 since we already include that
        config.envlist[:] = [env for env in config.envlist if not env.endswith('flake8')]

        make_envconfig = get_make_envconfig(make_envconfig)
        reader = get_reader(reader, config)

        add_style_checker(config, sections, make_envconfig, reader)
        add_style_formatter(config, sections, make_envconfig, reader)