[plt-scheme] PLT Scheme svn uninstall

Hi list !
i've been using PLT Scheme since last year, i compile source code via  
svn repository with the unix-style on my macbook, but i wanted to try  
using it with the mac-style so i have to uninstall it first. I don't  
know how to do it, is there a script to rm everything in the /usr/ 
local bin lib etc ???

Thanks in advance !