Comment #1 on issue 357 by hea...@gmail.com: error messages while compiling a c++ program that uses .proto file.
http://code.google.com/p/protobuf/issues/detail?id=357
You can't "using" a namespace that doesn't exist. This is a standard C++ issue. There's no way the namespace "google::protobuf" could have been defined before you included even a single header file!
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