Unknown option: help
USAGE: chkstow [options]

Options:
    -t DIR, --target=DIR  Set the target directory to DIR
                          (default is /usr/local/)
    -b, --badlinks        Report symlinks that point to non-existent files
    -a, --aliens          Report non-symlinks in the target directory
    -l, --list            List packages in the target directory

--badlinks is the default mode.