Just a note if anyone else's trying to get a NES emulator working with OZ 3.5.1 on a SL-5500- when I tried I think it complained that libSDL didn't have some String symbol. I tried
zfceu though, as mentioned by zaurusbs
here, and after installing zfceu and the libSDL in that package (not sure if that was needed or not, didn't try it with just the SDL from the OZ feed, but the two seem to coincide fine) and running makecompat on it it worked great, although zfceu_gui complains. Haven't tried the sound yet, I've stuck to the flags mentioned in the readme in that package.
Good luck all you Zaurusers, and a great thanks to all who've contributed information and work to the community!