Unfortunately GitHub doesn't include the required git submodules available in
the repository in their zip / tar.gz packages, so you need to download the
related source manually separately. This leads to the same error below also
if you haven't cloned the repository with the
switch, resulting with the error:
CMake Error at lib/CMakeLists.txt:NNN (add_subdirectory):
The source directory
does not contain a CMakeLists.txt file.
-- Configuring incomplete, errors occurred!
git submodule update --init --recursive from the project directory.