OK. Found gmock . It's now googletest .
I had to manually create the correct folders though.
These are my notes
HERE="/tmp/protobuf-build"
### https://github.com/google/protobuf/releases/tag/v3.0.0
tar -xvf protobuf-3.0.0.tar.gz
### https://github.com/google/googletest
unzip googletest-master.zip
mv "$HERE"/googletest-master/googlemock/ "$HERE"/protobuf-3.0.0/gmock
mv "$HERE"/googletest-master/googletest/ "$HERE"/protobuf-3.0.0/googletest
#cd "$HERE"/protobuf-3.0.0
#./autogen.sh
#./configure --prefix=/usr/local
#make
#sudo make DESTDIR=/tmp/protobuf install-strip
It built OK but make check didn't succeed. Not sure about that.
I'll see if I can package it up and send you a link via PM. If it doesn't work, someone else may give it a try since I have no means to test it.