title: Installing Google Protocol Buffers on mac
body: <p>I would like to install the older version of Google Protocol Buffers (protobuf-2.4.1) on Mac using the command line/Terminal app.</p>
  <p>I tried with <code>brew install protobuf</code>, but the latest version 2.5.0 has been installed.</p>
  <p>Is it possible to install the older version from the terminal?</p>