(compile -s -O3 -d1 bitstring-lowlevel.scm -j bitstring-lowlevel)
(compile -s -O2 -d0 bitstring-lowlevel.import.scm)
(compile -s -O3 -d1 bitstring.scm -j bitstring)
(compile -s -O2 -d0 bitstring.import.scm)

(install-extension
  'bitstring
  '("bitstring.so" "bitstring.import.so"
    "bitstring-lowlevel.so" "bitstring-lowlevel.import.so")
  ; Assoc list with properties for your extension:
  '((version "1.34") ;; version number should be a string
  ))