title: Installed clang++3.6 on Ubuntu, can't select as alternative
body: <p>I just installed clang++3.6 on my Ubuntu machine, but can't set it as the  default c++ compiler. </p>
  
  <pre><code>sudo update-alternatives --config c++ 
  </code></pre>
  
  <p>tells me that </p>
  
  <pre><code>There is only one alternative in link group c++ (providing /usr/bin/c++): /usr/bin/g++
  Nothing to configure.
  </code></pre>
  
  <p>and clang++ doesn't show up in </p>
  
  <pre><code>sudo update-alternatives --query c++
  </code></pre>
  
  <p>either (which was to be expected). But the compiler definitely works: </p>
  
  <pre><code>which clang++-3.6 
  /usr/bin/clang++-3.6
  </code></pre>
  
  <p>My OS version is  Ubuntu 14.04.1 LTS.</p>
  
  <p><strong>What do I have to do to make <code>update-alternatives</code> include clang++3.6?</strong></p>
  
  <p>Note: I previously used clang3.4, but removed it since it doesn't support all c++11 feature I require. It seems that this is still the version installed when simply installing the clang++ package (I specifically installed clang++3.6); <code>update-alternatives</code> DID work for that version. </p>