title: Add user libraries to Ant Builder classpath
body: <p>I am having a problem with setting up an Ant Builder for my Eclipse projects.</p>
  
  <p>I do have several 3rd party libs configured as user libraries within Eclipse. Those libraries are added to the build path of my projects and everything is working fine.</p>
  
  <p>My problem is, that if I want to use the Ant Builder from Eclipse, I will have to add some of the user libraries to the classpath of the Ant Builder to get it working. I need those Libs because they include several task defs and type defs for Ant, NOT TO COMPILE MY PROJECTS. But how can I add those user libraries to the Ant Builder classpath? I don't want to "hard-code" them by adding them manually, because if I must change one those libs in the future, I will also have to maintain all Ant Builders. And I dont't know how load determine the path to the user libraries at runtime within Ant to load them dynamically, because I need those libs at the bootstrap of Ant to be able to define my needed Ant Tasks successfully.</p>