UINib not found when iOS target is 3.1.3
<p>Hi
I am using SDK 4.1 to build an iPhone app and I set the target OS to 3.1.3.
When I install the app on devices running iOS4.1. everything goes smoothly. 
When I try to run the app on devices running 3.1.3 I get the stacktrace below.</p>

<pre><code>dyld: Symbol not found: _OBJC_CLASS_$_UINib
  Referenced from: /var/mobile/Applications/BDD67A1E-9B40-43E7-A012-7D92036B2E24/ThisIsMy.app/ThisIsMy
Expected in: /System/Library/Frameworks/UIKit.framework/UIKit
 in /var/mobile/Applications/BDD67A1E-9B40-43E7-A012-7D92036B2E24/ThisIsMy.app/ThisIsMy
</code></pre>

<p>My guess is that it's because UINib was only added to the SDK in 4.0. </p>

<p>What I would like to know is how you mitigate this problem. What should I do to support 3.1.3?</p>

<p>Cheers..</p>
