CMUCL corefile problems

I tried saving a corefile with (save-matlisp).  The corefile seems to
save fine, but if I start up a new cmulisp with that corefile, there's
no help function.  Everything else seems to be there (or at least a
bunch of other functions that I tried), but help is undefined.

It may or may not be relevant that I am using the debian cmucl, which
has a built in "help" function, and so in my .cmucl-init, I load the
matlisp/start.lisp file, then I

(unintern 'help)
(use-package :matlisp)

Any ideas how to get the help back in my core file?

Cheers,

rif