dyld: Symbol not found: _NSURLAuthenticationMethodClientCertificate when trying to run iOS app

Edited to include two possible steps you need to take:

  1. Make sure you have Foundation framework to your project. (Remove
    and add it again to be sure).
  2. Make sure the Foundation framework include is before CFNetwork.

There seems to be a change in which headers include what in iOS8.0 (the glextensions file, for example, is no longer in the top header). If you explicitly add Foundation framework to your project, it will build fine. Making CFNetwork optional will, of course, lead to failures and is only a solution for the build error and not a solution overall.

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