The Libertine Scope is a Unity Scope that surfaces application launchers contained in Libertine sandboxes.
See the file debian/control for a list of required build dependencies.
Once the build dependencies are installed, all you should need to do to build the project is the following set of commands.
mkdir build && cd build
cmake ..
make
Without system installation, you can test the scope using the unity-scope-tool package available in the Ubuntu archives.
unity-scope-tool build/scope/apps/libertine-scope.ubuntu_libertine-scope.ini