case $(uname -s) in
Linux)
  install_package "truffleruby-20.0.0" "https://github.com/oracle/truffleruby/releases/download/vm-20.0.0/truffleruby-20.0.0-linux-amd64.tar.gz#48331324185773bf38d34a945b410d58a71ea7d206015cea1d4da5ce51cfef30" truffleruby
  ;;
Darwin)
  install_package "truffleruby-20.0.0" "https://github.com/oracle/truffleruby/releases/download/vm-20.0.0/truffleruby-20.0.0-macos-amd64.tar.gz#3ea8519f946c3807dc1e7deb9a0bbdaddef43713abc6352b0127ac085e2ff1eb" truffleruby
  ;;
*)
  colorize 1 "Unsupported operating system: $(uname -s)"
  return 1
  ;;
esac