-  --prefix
-  support srcdir
-  output installed file names to the file
-  single package installer
-  restruct setup.rb on the top of single package installers
-  developper level hook again
-  pass options to extconf.rb
-  --without-ext
-  (multi-package archive) package installation order
-  "ruby setup.rb" means "config; setup; install"
*  package checker (for developpers)
*  pass options to hook
?  .rpm/.deb automatic creation
?  restruct extconf.rb