Unable to generate gRPC pbs in Go - missing files

[alex]

$ make LANGUAGE=go

mkdir -p ./gens

protoc --proto_path=.:/usr/local/include --go_out=plugins=grpc:./gens google/api/*.proto

google/protobuf/descriptor.proto: File not found.

google/api/annotations.proto: Import "google/protobuf/descriptor.proto" was not found or had errors.

google/api/annotations.proto:26:8: "google.protobuf.MethodOptions" is not defined.

[libprotobuf WARNING google/protobuf/descriptor.cc:6117] Warning: Unused import: "google/api/annotations.proto" imports "google/api/http.proto" which is not used.

make: *** [google/api/annotations.pb.go] Error 1

[alex]

Sorry, forgot to mention. I was referring to https://github.com/google/googleapis