This looks much closer to the full script.  Again for space reasons,
we didn't package binaries for the other compilers, so you must build
them first (with objtype=386).  Then you can build the libraries and
user-level programs.  But the bitsy kernel needs booting stuff, so you
must then build in /sys/src/boot/arm before you can build in
/sys/src/9/bitsy.

-rob