how to compile iPhone sdk 3.0 project in iPhone sdk4
<p>Just upgraded to iPhone sdk4 and getting a lot of errors in my iPhone sdk3.0 projects.</p>

<p>Here are some - 
  "_OBJC_CLASS_$_NSMutableURLRequest", referenced from:
  "_OBJC_CLASS_$_UITabBar", referenced from:
  "_OBJC_METACLASS_$_UIViewController", referenced from:</p>

<p>about 66 errors ... </p>

<p>Any idea what is wrong here... </p>

<p>Thanks
Saurabh</p>
