From Foochal

How to install

• Install the graphviz rpm

rpm -Uvh ftp://rpmfind.net/linux/fedora/extras/4/i386/graphviz-2.6-1.fc4.i386.rpm

• Add snippet in LocalSettings.php

vi /usr/local/mediawiki/LocalSettings.php

Add this code at the end of the file

# Graphviz
 include("extensions/Graphviz.php");
 $wgGraphVizSettings->dotCommand = "/usr/bin/dot";
?>

Make sure that images directory is writable by apache

chmod g+w -R /usr/local/mediawiki/images