title: Symbol not found: _UIKeyboardFrameEndUserInfoKey on iPhone 3.1.3
body: <p>I rebuilt my project from scratch as I move towards a universal app.  I also wanted a fresh project without a lot of history.  Anyway, for some reason my new project only seems to support devices 3.2 and above.  I am compiling with 4.0 SDK and device target 3.0, but something must be wrong somewhere because on my 3.1.3 device it won't install because of an symbol not found.</p>
  
  <p>iPhone 3.1.3:
  Running…
  [Switching to thread 11779]
  [Switching to thread 11779]
  sharedlibrary apply-load-rules all
  continue
  dyld: Symbol not found: _UIKeyboardFrameEndUserInfoKey
    Referenced from: /var/mobile/Applications/150D69B7-9E40-41AA-8A43-F0E2C74A16A7/myappname.app/myappname
    Expected in: /System/Library/Frameworks/UIKit.framework/UIKit
  Data Formatters temporarily unavailable, will re-try after a 'continue'. (Not safe to call dlopen at this time.)</p>