plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%2BDL%2BWindows%E3%81%AB%E3%81%8A%E3%81%91%E3%82%8BCaffe%E3%82%A4%E3%83%B3%E3%82%B9%E3%83%88%E3%83%BC%E3%83%AB
plugin=diff is not implemented.