Copy the directory cmake-add-subdirectory-lib to a new location and then
place a copy of spacy-cpp within it. Example:
cp -a spacy-cpp/examples/cmake-add-subdirectory-lib ~/myproj
cp -a spacy-cpp ~/myproj/
For testing the example project in-place without copying it to a new location, one can simulate the above by setting up a symbolic link:
ln -s ../.. spacy-cpp
Commands to build the example project:
mkdir -p build && cd build && cmake .. && make