Ubuntu Protobuf compile

See https://github.com/protocolbuffers/protobuf/blob/master/src/README.md:

Prerequesites

$ sudo apt-get install autoconf automake libtool curl make g++ unzip

Installation

1. From this page, download the protobuf-all-[VERSION].tar.gz.
2. Extract the contents and change in the directory
3. ./configure
4. make
5. make check
6. sudo make install
7. sudo ldconfig # refresh shared library cache.

Check if it works

$ protoc --version
libprotoc 3.6.1