case $(uname -s) in
Linux)
  install_package "truffleruby-1.0.0-rc16" "https://github.com/oracle/truffleruby/releases/download/vm-1.0.0-rc16/truffleruby-1.0.0-rc16-linux-amd64.tar.gz#58fee4266b68cfe4e90f46a005693955370a760ccaf28224c9fcbd59241ff4b5" truffleruby
  ;;
Darwin)
  install_package "truffleruby-1.0.0-rc16" "https://github.com/oracle/truffleruby/releases/download/vm-1.0.0-rc16/truffleruby-1.0.0-rc16-macos-amd64.tar.gz#86d385feab785abb8e9f84ac76900eec69082f15918c4d9edb478c00dcd8330b" truffleruby
  ;;
*)
  colorize 1 "Unsupported operating system: $(uname -s)"
  return 1
  ;;
esac