def METHOD_NAME(env):
    """Set MWCW_VERSION, MWCW_VERSIONS, and some codewarrior environment vars
    MWCW_VERSIONS is set to a list of objects representing installed versions
    MWCW_VERSION  is set to the version object that will be used for building.
                  MWCW_VERSION can be set to a string during Environment
                  construction to influence which version is chosen, otherwise
                  the latest one from MWCW_VERSIONS is used.
    Returns true if at least one version is found, false otherwise
    """
    desired = env.get('MWCW_VERSION', '')
    # return right away if the variables are already set
    if isinstance(desired, MWVersion):
        return 1
    elif desired is None:
        return 0
    versions = find_versions()
    version = None
    if desired:
        for v in versions:
            if str(v) == desired:
                version = v
    elif versions:
        version = versions[-1]
    env['MWCW_VERSIONS'] = versions
    env['MWCW_VERSION'] = version
    if version is None:
      return 0
    env.PrependENVPath('PATH', version.clpath)
    env.PrependENVPath('PATH', version.dllpath)
    ENV = env['ENV']
    ENV['CWFolder'] = version.path
    ENV['LM_LICENSE_FILE'] = version.license
    plus = lambda x: '+%s' % x
    ENV['MWCIncludes'] = os.pathsep.join(map(plus, version.includes))
    ENV['MWLibraries'] = os.pathsep.join(map(plus, version.libs))
    return 1