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After updating from Protocol Buffers 2.5.0 to 2.6.0 compilation of the generated source failed: "This file was generated by an older version of protoc which is incompatible with your Protocol Buffer headers. Please regenerate this file with a newer version of protoc.". Turns out the source and headers generated by way of FindProtobuf.cmake:PROTOBUF_GENERATE_CPP aren't updated. Adding a dependency on the compiler executable fixes this issue.
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