I did a search for "lipportaudio" and only found this thread, and your more recent one.
I'm pretty sure the path below is created when you have zgcc-3.4.5-4.squashfs mounted, (or 3.4.6 version).
I would just copy
/opt/native/arm/3.4.6-xscale-softvfp/arm5tel-cakco-linux/lib/libportaudio.so
to
/usr/lib/lipportaudio.so
I don't have a compiling setup at the moment. I tried it last Winter, but some of the stuff went over my head.
Another question, Do you have the full "spitz" version of pdaxii13 installed?
This library may be contained in another library in the "full" version.
I searched inside "hdimage-full.tgz" of "build-5.4.9-beta" and didn't find "libportaudio.so" in any of the usual places.
I just have the "Akita" version of pdaXii13v2 installed on my C3200 and didn't find this lib on my Zaurus.
On an unrelated subject:
I noticed that "Wifi-Radar" requires "flite" for some audio stuff, but it works for me without "flite".