Please go to the GP2X Wolf3D Sourceforge page for binary builds or source code.
You might want to use the GP32 Shareware Wolfenstein3D and Demo SOD datafiles to get up and running.
This port is based on Wolfenstein 3D Linux.
Also, please check out my other GP2X creations.
Of course, you will want to play Wolfenstein on a real GP2X. I highly recommend purchasing one from Play-Asia.
If you have tried Wolfenstein 3D on your GP2X and it looked like this, then you need to replace some of your datafiles with the files in the vgafiles.zip archive.
If you want to contact me, you can find me at the GP32X message boards.