To install gp2xPd on your gp2x you need to install the following software:

The pd binary is included with the CVS download, but if you'd like to patch PDa yourself you can. Just download the source from the PDa website and apply this patch using patch -p1 gp2x-PDa.patch inside the source directory. See src/gp2x.readme after applying the patch for more information about getting it to compile.