title: google calendar API in iPhone app!
body: <p>I just add gcal to my project according to this tutorial <a href="http://www.youtube.com/watch?v=it_9H0GxRNI" rel="nofollow noreferrer">http://www.youtube.com/watch?v=it_9H0GxRNI</a>
  but 12 errors is appeared:</p>
  
  <pre><code>"_SecItemAdd", referenced from:
            -[GDataOAuthKeychain setPassword:forService:account:error:] in GDataOAuthViewControllerTouch.o
        "_kSecMatchLimit", referenced from:
            _kSecMatchLimit$non_lazy_ptr in GDataOAuthViewControllerTouch.o
        "_kSecClassGenericPassword", referenced from:
            _kSecClassGenericPassword$non_lazy_ptr in GDataOAuthViewControllerTouch.o
        "_SecItemDelete", referenced from:
            -[GDataOAuthKeychain removePasswordForService:account:error:] in GDataOAuthViewControllerTouch.o
        "_kSecAttrGeneric", referenced from:
            _kSecAttrGeneric$non_lazy_ptr in GDataOAuthViewControllerTouch.o
        "_SecItemCopyMatching", referenced from:
            -[GDataOAuthKeychain passwordForService:account:error:] in GDataOAuthViewControllerTouch.o
        "_kSecValueData", referenced from:
            _kSecValueData$non_lazy_ptr in GDataOAuthViewControllerTouch.o
        "_kSecReturnData", referenced from:
            _kSecReturnData$non_lazy_ptr in GDataOAuthViewControllerTouch.o
        "_kSecAttrAccount", referenced from:
            _kSecAttrAccount$non_lazy_ptr in GDataOAuthViewControllerTouch.o
        "_kSecClass", referenced from:
            _kSecClass$non_lazy_ptr in GDataOAuthViewControllerTouch.o
        "_kSecAttrService", referenced from:
            _kSecAttrService$non_lazy_ptr in GDataOAuthViewControllerTouch.o
        "_kSecMatchLimitOne", referenced from:
            _kSecMatchLimitOne$non_lazy_ptr in GDataOAuthViewControllerTouch.o
      ld: symbol(s) not found
      collect2: ld returned 1 exit status
  Build failed (12 errors, 1 warning)
  </code></pre>
  
  <p>And no errors appears in console! what is the problem? :(</p>