On the machine you use for this setup, you need to have installed a Linux/*BSD with a working Apache (1 or 2) with mod_php4.
Getting the needed module from SVN
You need to checkout the www module from our SVN, it's located in /trunk. The www module will be the documentroot of your apache, therefor keep care that the apache process can read this dir.
Setup of the Apache vHost for the Staging
You need to setup a vHost for the staging, here an example to have some vHost for your localhost running on port 8080.
Listen 8080 <VirtualHost 127.0.0.1:8080> DocumentRoot <path_to_www> ErrorDocument 404 /media/404.php </VirtualHost>