Compileing help

Hi I am trying to compile Xshipwars ( http://wolfpack.twu.net/ShipWars/XShipWars/download.html ) and when I try to compile it. It comes back and says: Object `libX11.so' not found in defined platform paths!

I think it has to do with x-windows but if this is the casw why was it not intalled when I installed x-windows? and how do I fix it?Xshipwars download

that, or your path wasn't set up right. try 'locate <whatever that file was>' in the terminal. if it finds it, then you just gotta fix your path.

No luck. It cant find that file. as if it was never installed.