PHP4 on Fedora Core 7

[gears]

OK, OK, I know what you're all going to say here - use PHP5, it's better and is backwardly compatible etc etc. However, I've tried php5 and 99.5% of the site is working on my server apart from some dodgy phpBB modules and tweaks, which aren't working properly.

 

Is there a way to (a) change php5 compatibility to be "super compatible" with php4 so far back so that it effectively operates like php4 or (b) install php4 onto Fedora Core 7 ? I've tried it myself and downloaded the tar.gz file, done the make, make install etc but there's no libphp4.so anywhere and it doesn't appear to have done anything after install.

 

Any ideas? I know this is a tad generic, and in reality I SHOULD just put PHP5 back on but I'm looking to replicate the setup of another server and - unfortunately - this new quad-core box will only accept a newer OS. I've tried Debian etc but the SATA Controller and Motherboard isn't yet supported so I'm stuck between a rock and a hard place.