UE4 build sytem: how do I add an Actor Class to the engine source

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I am trying to derive a class from ACameraActor and I am getting unresolved symbols linker errors such as:

“public: virtual void __cdecl ACameraActor::Serialize(class FArchive &)” (?Serialize@ACameraActor@@UEAAXAEAVFArchive@@@Z)".

ACameraActor::Serialize() is not marked for export so it can’t be accessed or overridden outside the module its defined in. File a bug report about this on AnswerHub. In the meantime you can fix this in your own fork of the engine source by prefixing that method declaration with ENGINE_API.