title: How to view diff of a forked github project
body: <p>I have forked a project on github and need to have a set of changes I made since I forked, in diff format.</p>
  
  <p>If you wonder - I've forked Apache httpd and I'm changing some code in core. Currently I'm not commiting any changes, running git diff, and use its output as a patch against vanilla httpd sources in an RPM building process. It is, of course, wrong, but I don't know how to do it properly. All I know is I need a diff in the end.</p>