case $(uname -s) in
Linux)
  install_package "truffleruby-19.0.0" "https://github.com/oracle/truffleruby/releases/download/vm-19.0.0/truffleruby-19.0.0-linux-amd64.tar.gz#42b37f6e36a04bdd7319f7ad46f9790e7f8234a910c12229625afb0931b1d2d9" truffleruby
  ;;
Darwin)
  install_package "truffleruby-19.0.0" "https://github.com/oracle/truffleruby/releases/download/vm-19.0.0/truffleruby-19.0.0-macos-amd64.tar.gz#962003deaae6eff3150a9682287636445088bedf667bf62c635646659878ec49" truffleruby
  ;;
*)
  colorize 1 "Unsupported operating system: $(uname -s)"
  return 1
  ;;
esac