case $(uname -s) in
Linux)
  install_package "truffleruby-1.0.0-rc8" "https://github.com/oracle/truffleruby/releases/download/vm-1.0.0-rc8/truffleruby-1.0.0-rc8-linux-amd64.tar.gz#080e066272184a72dc8019841ad0bca015cfa4ab979c6605c30346fcc0604597" truffleruby
  ;;
Darwin)
  install_package "truffleruby-1.0.0-rc8" "https://github.com/oracle/truffleruby/releases/download/vm-1.0.0-rc8/truffleruby-1.0.0-rc8-macos-amd64.tar.gz#e627b43cdd5e8f1711704c6a2f5a1503957df7b226fd722771c54ea6c217457a" truffleruby
  ;;
*)
  colorize 1 "Unsupported operating system: $(uname -s)"
  return 1
  ;;
esac