{ "defaults":
  { "type": ["CC/proto", "defaults"]
  , "PROTOC": ["protoc"]
  , "LDFLAGS": ["-lprotobuf"]
  , "PATH": ["/bin", "/usr/bin"]
  }
, "service defaults":
  { "type": ["CC/proto", "defaults"]
  , "base": ["defaults"]
  , "GRPC_PLUGIN": ["/usr/bin/grpc_cpp_plugin"]
  , "ADD_LDFLAGS": ["-lgrpc++", "-lgrpc", "-lgpr"]
  }
}