title: Keep getting error messages when compiling newest version of admob on IOS6 SDK
body: <p>I've downloaded the newest version of googles admob sdk. But now I keep getting the following error when compiling in xcode 4.5 with the latest sdk.</p>
  
  <pre><code>Undefined symbols for architecture i386:
    "_OBJC_CLASS_$_ASIdentifierManager", referenced from:
        objc-class-ref in libGoogleAdMobAds.a(GADIdentifierUtilities.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>
  
  <p>Any idea on what could be wrong?</p>