I finally got arc2c to work (without GC as you suggested). One note though: apparently arc2c relies on rm-global.arc, but doesn't load it by default. So under the current version of the compiler, 'compile-file will error until you (load "rm-global.arc").
Oops. Must have forgotten to add it to arc2c.arc then ^^. Unfortunately I won't be able to fix this until maybe 7 hours from now T.T, haha, I'm in the office ^^
The thing about GC working: well, you need to somehow download the development version of Boehm GC, and, well, that's what's stopping me for now T.T