title: xcode collect2: ld returned 1 exit status - how to resolve?
body: <p>From what I have read this is supposed to be when the linker (not exactly sure how that works) can't find a symbol. the symbol in question is: SCNetworkReachabilityCreateWithAddress as can be seen from the full error message below. </p>
  
  <ul>
  <li>the thing is that the correct
  framework is added to my target.</li>
  <li>xcode recognises the symbol OK, i.e.
  there is no error message in the .m
  file.</li>
  <li>the .m file is added to the correct
  target so I'm not at all sure what to
  do. </li>
  </ul>
  
  <p>Any ideas please?</p>
  
  <pre><code>"SCNetworkReachabilityCreateWithAddress", referenced from:
  
  -[AppWelcomeVC viewDidLoad] in AppWelcomeVC.o
  
  ld: symbol(s) not found
  
  collect2: ld returned 1 exit status
  </code></pre>