It seems this German fellow is having the exact same problem I am having trying to get xmms to go on a sharp rom and a 5600.
It seems I have to do some symlinking but I can't seem to figure out what the answer is.
Here is the last few lines from trying to run xmms at the command line running as zaurus:
Internal bps 176400
Allocating memory soon! 529200000 bytes
Allocating memory! 529200000 bytes
GLib-ERROR **: could not allocate 529200000 bytes