title: Fabric and Digits pods failing workspace in Xcode 7 and Swift 2.0
body: <p>I updated to Xcode 7 and fixed the necessary code (syntax) changes for Swift 2.0. I updated my Podfile with these 2 entries:</p>
  
  <pre><code>  pod 'Fabric'
    pod 'Digits'
  </code></pre>
  
  <p>and now see many build errors (pasted below). Any ideas?</p>
  
  <p>I ran <code>sudo gem install cocoapods</code> to update my Cocoapods, and then ran <code>pod install</code> and <code>pod update</code> in order to install 'Fabric' and 'Digits' pods. </p>
  
  <p>Note: Prior to updating to Xcode 7, my project, which uses Digits, was building and working correctly!</p>
  
  <pre><code>Undefined symbols for architecture x86_64:
    "_OBJC_CLASS_$_FABJLObjectDeserializer", referenced from:
        objc-class-ref in DigitsKit(DGTUserNetworking.o)
        objc-class-ref in DigitsKit(DGTAuthNetworking.o)
    "_OBJC_CLASS_$_FABJLObjectSerializer", referenced from:
        objc-class-ref in DigitsKit(DGTAuthNetworking.o)
    "_OBJC_CLASS_$_TFSScribe", referenced from:
        objc-class-ref in DigitsKit(Digits.o)
    "_OBJC_CLASS_$_TWTRAPIResponseValidator", referenced from:
        objc-class-ref in DigitsKit(DGTNetworkingHelper.o)
    "_OBJC_CLASS_$_TWTRAuthConfig", referenced from:
        objc-class-ref in DigitsKit(Digits.o)
    "_OBJC_CLASS_$_TWTRColorUtil", referenced from:
        objc-class-ref in DigitsKit(DGTAppearance.o)
    "_OBJC_CLASS_$_TWTRCoreLanguage", referenced from:
        objc-class-ref in DigitsKit(DGTAuthNetworking.o)
    "_OBJC_CLASS_$_TWTRDictUtil", referenced from:
        objc-class-ref in DigitsKit(DGTLogInAuthConfiguration.o)
        objc-class-ref in DigitsKit(DGTDeviceRegisterConfiguration.o)
    "_OBJC_CLASS_$_TWTRGuestSessionRefreshStrategy", referenced from:
        objc-class-ref in DigitsKit(Digits.o)
    "_OBJC_CLASS_$_TWTRKeychainWrapper", referenced from:
        objc-class-ref in DigitsKit(DGTSessionMigrator.o)
    "_OBJC_CLASS_$_TWTRNetworkingPipeline", referenced from:
        objc-class-ref in DigitsKit(DGTNetworkingHelper.o)
    "_OBJC_CLASS_$_TWTRResourcesUtil", referenced from:
        objc-class-ref in DigitsKit(DGTURLSessionConfig.o)
        objc-class-ref in DigitsKit(DGTResourcesUtil.o)
    "_OBJC_CLASS_$_TWTRScribeClientEventNamespace", referenced from:
        objc-class-ref in DigitsKit(DGTScribeEventLogger.o)
    "_OBJC_CLASS_$_TWTRScribeEvent", referenced from:
        objc-class-ref in DigitsKit(DGTScribeEventLogger.o)
    "_OBJC_CLASS_$_TWTRScribeService", referenced from:
        objc-class-ref in DigitsKit(Digits.o)
    "_OBJC_CLASS_$_TWTRSessionStore", referenced from:
        objc-class-ref in DigitsKit(Digits.o)
    "_OBJC_CLASS_$_TWTRURLSessionDelegate", referenced from:
        objc-class-ref in DigitsKit(DGTNetworkingHelper.o)
    "_OBJC_CLASS_$_TWTRUserSessionVerifier", referenced from:
        objc-class-ref in DigitsKit(DGTSessionVerifier.o)
    "_OBJC_CLASS_$_TWTRUtils", referenced from:
        objc-class-ref in DigitsKit(DGTAuthViewController.o)
        objc-class-ref in DigitsKit(DGTConfirmSignUpViewController.o)
        objc-class-ref in DigitsKit(DGTConfirmLogInViewController.o)
        objc-class-ref in DigitsKit(DGTUploadContactsViewController.o)
        objc-class-ref in DigitsKit(Digits.o)
        objc-class-ref in DigitsKit(DGTConfirmViewController.o)
        objc-class-ref in DigitsKit(DGTContacts.o)
        ...
    "_OBJC_CLASS_$_TwitterNetworking", referenced from:
        objc-class-ref in DigitsKit(DGTUserNetworking.o)
        objc-class-ref in DigitsKit(DGTContactsNetworking.o)
        objc-class-ref in DigitsKit(DGTAuthNetworking.o)
    "_TWTRAPIURLWithPath", referenced from:
        -[DGTUserNetworking verifyUser:completion:] in DigitsKit(DGTUserNetworking.o)
        -[DGTOAuthSigning OAuthEchoHeadersToVerifyCredentialsWithParams:] in DigitsKit(DGTOAuthSigning.o)
        -[DGTContactsNetworking uploadContactVCards:completion:] in DigitsKit(DGTContactsNetworking.o)
        -[DGTContactsNetworking lookupContactMatchesWithCursor:completion:] in DigitsKit(DGTContactsNetworking.o)
        -[DGTContactsNetworking destroyAllContactsWithCompletion:] in DigitsKit(DGTContactsNetworking.o)
        -[DGTAuthNetworking registerDeviceWithPhoneNumber:withVerificationType:completion:] in DigitsKit(DGTAuthNetworking.o)
        -[DGTAuthNetworking confirmAccountWithPhoneNumber:confirmationNumber:completion:] in DigitsKit(DGTAuthNetworking.o)
        ...
    "_TWTRCoreOAuthSigningOAuthEchoHeaders", referenced from:
        -[DGTOAuthSigning OAuthEchoHeadersForRequestMethod:URLString:parameters:error:] in DigitsKit(DGTOAuthSigning.o)
    "_TWTRCoreVersion", referenced from:
        +[Digits assertValidTwitterCoreVersion] in DigitsKit(Digits.o)
    "_TWTRNetworkingErrorDomain", referenced from:
        -[DGTAuthViewController startLogInProcessWithVerificationType:] in DigitsKit(DGTAuthViewController.o)
        -[DGTConfirmSignUpViewController startSignUpProcess] in DigitsKit(DGTConfirmSignUpViewController.o)
        -[DGTConfirmLogInViewController startLogInProcess] in DigitsKit(DGTConfirmLogInViewController.o)
        -[DGTPinCodeFormViewController startVerifyPINCode] in DigitsKit(DGTPinCodeFormViewController.o)
    "_TWTRNetworkingUserAgentHeaderKey", referenced from:
        +[DGTURLSessionConfig defaultAdditionalHeaders] in DigitsKit(DGTURLSessionConfig.o)
    "_TWTRScribeClientEventNamespaceEmptyValue", referenced from:
        -[DGTScribeViewEventLogger viewDidShow] in DigitsKit(DGTScribeViewEventLogger.o)
        -[DGTScribeViewEventLogger viewDidSucceed] in DigitsKit(DGTScribeViewEventLogger.o)
        -[DGTScribeViewEventLogger didShowFailureView] in DigitsKit(DGTScribeViewEventLogger.o)
        -[DGTScribeViewEventLogger errorDidOccurWithCode:] in DigitsKit(DGTScribeViewEventLogger.o)
        +[DGTScribeViewEventLogger scribeViewNameWithScribeView:] in DigitsKit(DGTScribeViewEventLogger.o)
        +[DGTScribeEventLogger digitsUniquesImpressionNamespace] in DigitsKit(DGTScribeEventLogger.o)
        +[DGTScribeEventLogger digitsImpressionNamespace] in DigitsKit(DGTScribeEventLogger.o)
        ...
    "_TWTRScribeEventImpressionClient", referenced from:
        +[DGTScribeEventLogger digitsEventNamespaceWithComponent:element:action:] in DigitsKit(DGTScribeEventLogger.o)
    "_TWTRScribeEventImpressionPage", referenced from:
        +[DGTScribeEventLogger digitsEventNamespaceWithComponent:element:action:] in DigitsKit(DGTScribeEventLogger.o)
    "_TWTRScribeEventUniquesClient", referenced from:
        +[DGTScribeEventLogger digitsUniquesImpressionNamespace] in DigitsKit(DGTScribeEventLogger.o)
    "_TWTRUserSessionVerifierDefaultDelay", referenced from:
        -[DGTSessionVerifier startVerification] in DigitsKit(DGTSessionVerifier.o)
  ld: symbol(s) not found for architecture x86_64
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>