Get GOV from github at https://github.com/aigan/gov
For installation, follow the instructions at: https://github.com/aigan/rdfbase6/wiki/RB-v6:-Installation
/var/www/gov should be a symlink to /usr/local/gov/html. To do that:
$ cd /var/www
(The above '$' is just a symbol of the shell prompt. You should type what comes after that.)
Remove or move the gov dir if you created it before this.
$ mv gov gov.old $ ln -s /usr/local/gov/html gov $ cd /usr/local
Follow the instructions located in gov/INSTALL.
Those instructuctions should be sufficient. Please ask for help if needed.