title: Adding Reachability class fails when I am trying to build
body: <p>I have added the SystemConfiguration framework. I am deploying against targets from 3.2 and higher. Have I forgotten to add something?</p>
  
  <pre><code>Undefined symbols for architecture i386:
    "_OBJC_CLASS_$_Reachability", referenced from:
        objc-class-ref in AppDelegate.o
  ld: symbol(s) not found for architecture i386
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>