page 20: … protoc command…
I had to additionally run the following go get commands in order to be able to compile protobuf code using gogo protobuf on a linux machine:
go get github.com/gogo/protobuf/proto
go get github.com/gogo/protobuf/jsonpb
go get github.com/gogo/protobuf/protoc-gen-gogo
go get github.com/gogo/protobuf/gogoproto
I don’t use Mac but it would be nice to mention that the setup on linux is different or point the readers to the git repo for installation instruction. https://github.com/gogo/protobuf/tree/master