case $(uname -s) in
Linux)
  install_package "truffleruby-1.0.0-rc11" "https://github.com/oracle/truffleruby/releases/download/vm-1.0.0-rc11/truffleruby-1.0.0-rc11-linux-amd64.tar.gz#268c38f01331db4cbeae584aea4e9336b6a01aa1fcc621dda1232dcaac89da45" truffleruby
  ;;
Darwin)
  install_package "truffleruby-1.0.0-rc11" "https://github.com/oracle/truffleruby/releases/download/vm-1.0.0-rc11/truffleruby-1.0.0-rc11-macos-amd64.tar.gz#c8c86fe7a77cacd690ddb64c66fbd92ff1f08788e40494cb4662b3d4731b02a6" truffleruby
  ;;
*)
  colorize 1 "Unsupported operating system: $(uname -s)"
  return 1
  ;;
esac