@classmethod
def clearLang(cls, env, lang='C'):
    """Reset the language settings of an environment dict
		to some expected value and return the result.
		"""
    env = dict(env)
    env['LANG'] = lang
    for i in {'LANGUAGE', 'LC_CTYPE', 'LC_NUMERIC', 'LC_TIME', 'LC_COLLATE',
        'LC_MONETARY', 'LC_MESSAGES', 'LC_PAPER', 'LC_NAME', 'LC_ADDRESS',
        'LC_TELEPHONE', 'LC_MEASUREMENT', 'LC_IDENTIFICATION'}:
        env.pop(i, None)
    return env
