Protocol Buffers 2.6.1 sudo apt-get install build-essential wget https://github.com/google/protobuf/releases/download/v2.6.1/protobuf-2.6.1.tar.gz tar -zxvf protobuf-2.6.1.tar.gz && cd protobuf-2.6.1/ ./configure make -j$(nproc) && make check make install protoc --version