plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%2BSL%2B%E3%83%8D%E3%83%83%E3%83%88%E3%83%AF%E3%83%BC%E3%82%AF%E7%8A%B6%E6%85%8B%E3%81%AE%E7%A2%BA%E8%AA%8D
plugin=diff is not implemented.