Better late than never… Synkro did a”quick and dirty”port of the 3D engine Yeti 3D to the GP2x. Release notes:

1st quick and dirty port of the Yeti 3D engine by Derek Evans for the GP2X. I just used for this the MacOS-SDL, Dreamcast and GP32 ports. It compiles and already runs on an actual GP2X. Have fun but mind the GPL.