Extension:Wikidiff

Wikidiff is PHP 5 module providing external diff engine for MediaWiki.

UNIX
Get from svn, $ svn co http://svn.wikimedia.org/svnroot/mediawiki/trunk/extensions/wikidiff

Or download tarball from, http://tools.wikimedia.de/~daniel/repository/extensions/wikidiff.tgz, $ tar zxf wikidiff.tgz $ cd wikidiff

$ make $ make install