Protocol Buffers

Not in the instructions

 git clone https://github.com/google/protobuf
 cd protobuf
 sudo apt-get install autoconf build-essential libtool
 ./autogen.sh
 ./configure
 make
 make check
 make install

later I needed

 export LD_LIBRARY_PATH=/usr/local/lib

and

 export PATH=$PATH:~/go/bin