protoc --go_out=plugins=grpc,import_prefix=,import_path=protomsg:$(pwd)/protomsg -I=/usr/local/Cellar/protobuf/2.6.0/include -I
extract protobuf-descriptor in your $GO_ROOT folder
building requirements: yum install libpcap-devel git version > 1.7.2 (use repoforge for centos)