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Summary: When system has protobuf package but hasn't protoc, cmake will be success: > -- ******** Summary ******** -- General: -- CMake version : 3.5.1 -- CMake command : /usr/bin/cmake -- Git version : v0.8.1-967-g27d12d8-dirty -- System : Linux -- C++ compiler : /usr/bin/c++ -- C++ compiler version : 5.4.0 -- Protobuf compiler : PROTOBUF_PROTOC_EXECUTABLE-NOTFOUND -- Protobuf include path : /usr/include -- Protobuf libraries : optimized;/usr/lib/x86_64-linux-gnu/libprotobuf.so;debug;/usr/lib/x86_64-linux-gnu/libprotobuf.so;-lpthread ... Then make will be failed. This submit make it to check protobuf package only when protoc has been found. This pull request is a clone of [1781](https://github.com/caffe2/caffe2/pull/1781), that pull request closed by mistake. Closes https://github.com/caffe2/caffe2/pull/1792 Differential Revision: D6800513 Pulled By: pietern fbshipit-source-id: 79a77a139f342ae0aaa2c37fc1d9a74e28a08422