case $(uname -s) in
Linux)
  install_package "truffleruby-19.2.0.1" "https://github.com/oracle/truffleruby/releases/download/vm-19.2.0.1/truffleruby-19.2.0.1-linux-amd64.tar.gz#38facb48768340efe638579b67a5e3f4cd8fa091006f7e098a654ddf3ec1bbac" truffleruby
  ;;
Darwin)
  install_package "truffleruby-19.2.0.1" "https://github.com/oracle/truffleruby/releases/download/vm-19.2.0.1/truffleruby-19.2.0.1-macos-amd64.tar.gz#3a1bef2706ea9dc430f45ec0d7bf798ef09526f39d5102d88ef6a1b74bea3c12" truffleruby
  ;;
*)
  colorize 1 "Unsupported operating system: $(uname -s)"
  return 1
  ;;
esac