title: Can I have two versions of GCC on Debian/Linux?
body: <p>In Debian Jessie/8 there is GCC 4.9.2.<br>
  I need the latest version, GCC 6.x.  </p>
  
  <p>Is it possible to install it through Synaptic from the testing repository (i.e. the binary, not the source), in parallel with the old version?  </p>
  
  <p>Is there a risk of conflicts among libraries/headers/... Are they going to be stored in separate directories like gcc-4.9/  gcc-6.0/  ...?</p>
  
  <p>So far, I have only been able to install a second compiler building it from source, in its own directory.</p>