[CentOS] CentOS-friendly wiki engine ?

Hi,

One of our local town halls has asked me to implement a wiki-based 
website dedicated to ecological farming. The wiki is supposed to host a 
variety of documents in text, video and audio format.

I've never used any wiki engines myself. Is there any one you can 
recommend in particular ? I'm using CentOS 5 on the server, so I would 
be glad to use a solution where I don't have to jump through burning 
loops (e. g. install a more recent version of PHP/Python/whatever) to 
make it work.

Cheers,

Niki