Porting to emscripten

Yesterday I came up with the rather stupid idea of porting clisp to
emscripten.  I've gotten the build to go rather far, as I have a
lisp.run that kind-of-sort-of works, but fails during the loading of
init.lisp here:
  
> ;; for the time being the files don't have to be searched:
> (sys::%putd 'search-file
>  (sys::make-preliminary
>   (function search-file (lambda (filename &optional extensions (keep-dirs t))
>     (declare (ignore keep-dirs))
>     (mapcan #'(lambda (directory)
>                 (let ((directory (pathname-directory directory)))
>                   (mapcan #'(lambda (extension)
>                               (let ((filename (merge-pathnames filename
>                                                 (make-pathname
>                                                  :directory directory
>                                                  :type extension))))
>                                 (if (probe-file filename) (list filename) '())))
>                           extensions)))
>             (cons #"" *load-paths*))))))

With the message:
> *** - LET: variable DECLARATIONS has no value

Any clues for how to start tracking this down?  My debugging facilities
are limited to
 1) modifying the lisp or C code
 2) generating a list of all C functions called
 3) generating a list of all branches taken and manually matching it up

-Jason

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