case $(uname -s) in
Linux)
  install_package "truffleruby-19.1.0" "https://github.com/oracle/truffleruby/releases/download/vm-19.1.0/truffleruby-19.1.0-linux-amd64.tar.gz#5fc68b22ee95259f62edaf3d80af9073461ced0931b61e50e2147a42724a9ada" truffleruby
  ;;
Darwin)
  use_homebrew_openssl
  install_package "truffleruby-19.1.0" "https://github.com/oracle/truffleruby/releases/download/vm-19.1.0/truffleruby-19.1.0-macos-amd64.tar.gz#9cb8e8374dd21928bf822394810988e37f1a7c804cf407fb2b2a0a50e9302f3b" truffleruby
  ;;
*)
  colorize 1 "Unsupported operating system: $(uname -s)"
  return 1
  ;;
esac