Unity 5.6 b9, iOS Cardboard native integration missing GVROverlayView.h file

I tried to compile a clean project for iOS in the latest Unity 5.6 beta (b9) with native Cardboard integration, but the build fails with the next error:

There is an #import of this file in CardboardAppController.mm, but the file GVROverlayView.h doesn't exist in the project.

There is something that I can do to solve this? It seems to me a too...

Unity 5.6 b9, iOS Cardboard native integration missing GVROverlayView.h file