It has come to my attention my game does not work under linux. If you have the proper dependancies, the only problem I can think of is the wrong case in data/graphics/index.txt. If you can tell me the error perhaps I could post a fixed index.txt.
I was worried about this, but I do not have any unix variants avalible.
The problem is that data/graphics/guns/M16.png and data/graphics/guns/M1a.png should be m16.png and m1a.png. Once those files are renamed, the game works. Thanks to evil