They have also released the source code for the game. That’s right, the complete source of Arx Fatalis is available for download."
The readme notes that the original game installation is required in order to play the compiled game, as the data files are certainly still copyrighted. Linux is in need of a good FPS dungeon crawler, though the code will need a hell of a lot of cleanup as it's a VC8/9 project and uses DirectX (ugh...)."
Link to Original Source