... yeah, my bad.
The current code ONLY works on a 64-bit OS. I've not worked out the details of a 64-bit build for OS X yet - I believe it's doable, but I've not spent much effort on it.
I'm in the middle of a major rewrite of the RT code to bring it up to the modular standards of my Multiforcer code, which will also allow me to easily support both 32 and 64 bit OSes, including ones without mmap. Otherwise, there's a 2GB limit on RT files... which is kind of useless, yes?
Donations are always welcome, though. More dev hardware would be nice.