在Ubuntu服务器8.10中用于Apache 2.2.9的PHP4

I recently moved from a windows based development environment to an ubuntu one. I need to have both PHP4 and PHP5 available (PHP4 is a company requirement, so not much I can decide about it). My problem is that I can't install PHP4, as it's not available as a package an it seems that the only way to get it would be to compile it. Can you point me to a good resource or tutorial on how to compile and install PHP4. I need to be able to easily switch between both versions, a là WAMPSERVER (If not possible I'll set for PHP4). Thanks.I recently moved from a windows based developme