Go to Terminal. It should start at your Home folder.
type: cd Desktop (case-sensitive so typing "cd desktop" is not that same as "cd Desktop". Basically navigate to the folder (exact name including case) where the beryl.tar.gz is. If it's on your desktop in a folder named Beryl then type: cd Desktop and then cd Beryl. If you want to go up a Directory then type cd ..)
type: tar xvf beryl.tar.gz (replace beryl with the file name for your beryl install file. This is to extract the files.)
type: cd beryl (go to the folder that you've extracted Beryl to)
type: ./configure (This will check for dependencies and builds your make file. Hopefully you don't get any errors at this point.)
type: su -m
*prompt for root password - type in your root password*
type: make install
type: make clean (this is optional to clean up temp files)
I hope this works for you.