title: Can I have Qt 4.8.1 and Qt 5.2.1 IDE's in Ubuntu?
body: <p>I have Ubuntu 12.04 LTS, with Qt4, version 4.8.1. It's installed from official repositories with all its associated environments (Qt Creator 2.5.2, and Qt Assistant + Qt Linguist + Qt Designer).</p>
  
  <p>I would like to install and begin to work with Qt 5.2 (preferably the new 5.2.1 that it's about to be released these days), with new environments (Qt Creator 3.0, and everything else).</p>
  
  <p>But I have several works in progress (specially an important one) in 4.8.1.</p>
  
  <p>Can I have both versions installed?
  Or, it would be better to have only one IDE but allowing to develop in both versions?</p>
  
  <p>What would be the best way to proceed (as far as I have seen, briefly)?</p>
  
  <ol>
  <li><a href="http://qt-project.org/downloads" rel="nofollow">Download installer from Qt's official site</a> and install (preferably offline installer)</li>
  <li>Download package and <code>make</code> + <code>make install</code></li>
  <li><p>Terminal:</p>
  
  <pre><code>sudo apt-add-repository ppa:ubuntu-sdk-team/ppa
  sudo apt-get update
  sudo apt-get install qt-sdk
  </code></pre></li>
  </ol>
  
  <p>And, what about to maintain that updated?</p>