# /usr/local/sbin/portsclean -C -L -P -D -D
Cleaning out /usr/ports/*/*/work...
done.
Detecting unreferenced distfiles...
/usr/local/sbin/portsclean:227:in `distclean': Cannot obtain DISTDIR! (RuntimeError)
        from /usr/local/sbin/portsclean:154:in `main'
        from /usr/local/lib/ruby/1.8/optparse.rb:755:in `initialize'
        from /usr/local/sbin/portsclean:69:in `new'
        from /usr/local/sbin/portsclean:69:in `main'
        from /usr/local/sbin/portsclean:691