c-sqld-sqlite.scm
(module c-sqld-sqlite mzscheme
  (define c-sqld-sqlite-available? #f)
  (provide c-sqld-sqlite-available?)

  (define-syntax provide-wrappers
    (syntax-rules ()
      [(_) (begin)]
      [(_ id1 id ...)
       (begin
	 (define (id1 . args)
	   (error 'id1 "extension not compiled"))
	 (provide id1)
	 (provide-wrappers id ...))]))

  (provide-wrappers
   c-sqlite-version
   c-sqlite-open
   c-sqlite-close
   c-sqlite-query
   c-sqlite-nrows
   c-sqlite-ncols
   c-sqlite-cell
   c-sqlite-lasterr))