I just join your mailing list, so I hope it's the right place for this "bug" report ! It took me some times to understand why the installation process was not finding "diff3" (it is the same in mediawiki 1.4... 1.5.2) on some of my computers, and I was surprised not to find this "bug" with google... Well in the file /config/index.php I fear there's a problem with the line : $versinfo = array('$1 --version 2>&1', 'diff3 (GNU diffutils)'); on Debian it gives diff3 -v diff3 (GNU diffutils) 2.8.1 whereas on FreeBSD it gives : -bash-2.05b$ diff3 --v diff3 - GNU diffutils version 2.7 You see the joke with the pattern matching test ? ;-) Therefore, I forced the compilation with $conf->diff3 = "/usr/bin/diff3"; However I still have lot of (I think independent) bugs (because of FreeBSD, not diff3, as it works fine under Debian), but it will be in another mail ;-) Hope this helps, Best regards, Cyril