(compile -s -O2 -d1 win32-msgbox-mod.scm -o win32-msgbox.so -j win32-msgbox)
(compile -s -O3 -d0 win32-msgbox.import.scm)
(compile -c -O3 -d0 -unit win32-msgbox win32-msgbox.scm -j win32-msgbox)

(install-extension
  'win32-msgbox
  '("win32-msgbox.so" "win32-msgbox.import.so" "win32-msgbox.o")
  '((version 1.0)
    (static "win32-msgbox.o")))