title: How to build a Jenkins project only when two other projects have successfully been built?
body: <p>I've figured out how to trigger another Jenkins project build after a successful build, but how do you solve next situation:</p>
  
  <p>Project A triggers project B and C. Project D should only be build if project B and C have successfully been built. I can't configure B to trigger project D because I'm not sure project C has been built yet, and vice versa.</p>