title: Swift - Use of undeclared type 'GTMOAuth2Authentication'
body: <p>I'm switching an application from Obj-C to Swift where I have Google+ sign in implemented.</p>
  
  <p>I have <code>GoogleOpenSource.framework</code> and <code>GooglePlus.framework</code> on my project, as well as the following lines on my bridging header:</p>
  
  <pre><code>#import &lt;GooglePlus/GooglePlus.h&gt;
  #import &lt;GooglePlus/GPPSignIn.h&gt;
  </code></pre>
  
  <p>Unfortunately, I still get the error <code>Use of undeclared type 'GTMOAuth2Authentication'</code> when trying to implement <code>- (void)finishedWithAuth:(GTMOAuth2Authentication *)auth error:(NSError *)error</code> on a <code>GPPSignInDelegate</code>.</p>
  
  <p>I'm using G+ SDK 1.7.1, as well as the final version of Xcode 6. </p>
  
  <p>Any ideas on what I may be missing?</p>
  
  <p>Cheers</p>