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