case $(uname -s) in
Linux)
  install_package "truffleruby-1.0.0-rc15" "https://github.com/oracle/truffleruby/releases/download/vm-1.0.0-rc15/truffleruby-1.0.0-rc15-linux-amd64.tar.gz#cad2538bda6230d290d67f9ee0c6ef06cb9d149e6f84f1b847e94da7d33ca99f" truffleruby
  ;;
Darwin)
  use_homebrew_openssl
  install_package "truffleruby-1.0.0-rc15" "https://github.com/oracle/truffleruby/releases/download/vm-1.0.0-rc15/truffleruby-1.0.0-rc15-macos-amd64.tar.gz#8b664a836ec080ddee043ae78de4d2c362ae840706dc045ede6c40af8533a6f2" truffleruby
  ;;
*)
  colorize 1 "Unsupported operating system: $(uname -s)"
  return 1
  ;;
esac