title: Can I concatenate environment variables in apache config?
body: <p>I have two environment variables in apache config, I want to concatenate them into one new environment variable. Is this possible?</p>
  
  <p>I realise this doesn't work, but it demonstrates the sort of thing I'm after:</p>
  
  <pre><code>SetEnv one foo
  SetEnv two bar
  SetEnv three one+two
  </code></pre>
  
  <p>...and then 'three' would have the value "foobar"</p>