def options(opt):
    """Adds command line options to the *waf* build environment

    :param opt: Options context from the *waf* build environment.
    :type opt: waflib.Options.OptionsContext
    """
    opt.add_option('--tree-loc', dest='tree_loc', default=False, action=
        'store_true', help='use physical file locations when printing tree')
