I'm guessing I didn't do the b1 build right. The compiler it generated builds, but doesn't even run. Do I need to add the unregistered options throughout the build, or just in the library?

Just the libraries and the RTS in b1, and the compiler in b2. You can check that things are working right by compiling up hello world against b1 (remember to add the options when compiling hello world too). Cheers, Simon