title: How to install two different version of same package with yum
body: <p>Say I want to install two different versions of same package. </p>
  
  <p>To be specific, I want to install two versions of Javascript binding for GNOME, gjs package. I want to have <code>gjs-1.38.1-1.fc20.x86_64</code>and <code>gjs-1.36.1-1.fc19.x86_64</code>. </p>
  
  <p>There are other packages in Fedora 20 which greatly depends on <code>gjs-1.38.1-1.fc20.x86_64</code> so it's impossible to replace it by <code>gjs-1.36.1-1.fc19.x86_64</code>. </p>
  
  <p>I have one specific program that is not compatible with <code>gjs-1.38.1-1.fc20.x86_64</code> and needs the previous one.</p>
  
  <p>So is it possible to install the previous version of gjs <code>gjs-1.36.1-1.fc19.x86_64</code> and to access the it by <code>/usr/bin/env gjs1</code> (<em>by some magic!</em>) to run the incompatible program without breaking anything? </p>