(compile -s -O2 -d1 bitstring.scm -j bitstring)
(compile -s -O2 -d0 bitstring.import.scm)

(install-extension
  'bitstring
  '("bitstring.so" "bitstring.import.so")
  ; Assoc list with properties for your extension:
  '((version "0.4") ;; version number should be a string
  ))