plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%2BSL%2BWCF%E3%82%B5%E3%83%BC%E3%83%93%E3%82%B9%E3%81%AE%E3%82%A8%E3%83%B3%E3%83%89%E3%83%9D%E3%82%A4%E3%83%B3%E3%83%88%E3%81%AE%E3%82%A2%E3%83%89%E3%83%AC%E3%82%B9%E3%82%92%E5%8B%95%E7%9A%84%E3%81%AB%E5%A4%89%E6%9B%B4%E3%81%99%E3%82%8B
plugin=diff is not implemented.