title: adding an external library to a project in Xcode 4.3
body: <p>Newbie here, trying to add the CHDataStructures library to a calculator project I'm working on.  I did as suggested in the accepted answer at <a href="https://stackoverflow.com/questions/6124523/linking-a-static-library-to-an-ios-project-in-xcode-4">Linking a static library to an iOS project in Xcode 4</a> and have ended up with this:</p>
  <p><img src="https://i.stack.imgur.com/5z3i4.png" alt="Xcode with library added" /></p>
  <p>Unfortunately, I get a <code>'CHDataStructures.h' file not found</code> error when I try to add the header to classes in my project (<code>Calculator.m</code>, for example).</p>
  <p>Any thoughts about how I can get the CHDataStructures library to be, like the Death Star, fully operational?</p>
  <p><strong>EDIT</strong></p>
  <p>Okay, here's trying both <code>$(SRCROOT)</code> and the absolute path.  Any thoughts?</p>
  <p><img src="https://i.stack.imgur.com/RIC9P.png" alt="with `$(SRCROOT)" /></p>
  <p><img src="https://i.stack.imgur.com/F2tiH.png" alt="with absolute path" /></p>