To my understanding, some things will cross compile and other things need alteration. If this is the type that does not need alteration and someone can give me instructions on how to do it, I'll compile it. I have gcc4, XCodes and a MacBook pro, so I should be able to do it.
Ok, let's try a "remote control"...
You need to do:
1. load AJZaurusUSB sources
2. read the HOWTO-MAKE
3. open the AJZaurusUSB.xcodeproj
4. press Build
5. a Terminal will come up.
6. type 'make'
7. it will ask for your system admin password
8. it should compile without errors
9. Save everything
10. Save everything again
11. Now comes the critical point: type 'make load' (it may ask again for the password)
12. connect the Zaurus through USB
13. The Mac might now Kernel Panic every moment....
14. if not, go to the Network Preferences and look if a "new interface" was found
15. configure the interface
16. try to ping the Zaurus
If everything works fine, type 'make install' to keep the driver permanently on your Mac (even after a reboot).
-- hns