case $(uname -s) in
Linux)
  install_package "truffleruby-1.0.0-rc13" "https://github.com/oracle/truffleruby/releases/download/vm-1.0.0-rc13/truffleruby-1.0.0-rc13-linux-amd64.tar.gz#26936811d08eed742b3ccf04ae7cc894abc0ba4e5c2cbfd3d43163d620f446e4" truffleruby
  ;;
Darwin)
  use_homebrew_openssl
  install_package "truffleruby-1.0.0-rc13" "https://github.com/oracle/truffleruby/releases/download/vm-1.0.0-rc13/truffleruby-1.0.0-rc13-macos-amd64.tar.gz#c3dd003ee97c69da2697e2c09e538e13252f2c409b07b4bde4e5acbdbbf5314c" truffleruby
  ;;
*)
  colorize 1 "Unsupported operating system: $(uname -s)"
  return 1
  ;;
esac