title: IntelliJ not letting me use JDK1.5
body: <p>I need to compile an old project using JDK 1.5, but when I try to build it in InntelliJ it tells me:</p>
  
  <pre><code>Error:java: Target option 1.5 is no longer supported. Use 1.6 or later.
  Error:java: Source option 5 is no longer supported. Use 6 or later.
  </code></pre>
  
  <p>I cannot use another IDE and I don't know how the project is building since I haven't worked in its development until now. Is there any way I can trick IntelliJ into letting me do this?</p>