The paths in the CMakeLists.txt are currently hardcoded. You will need to clone LLVM and Clang and build new versions yourself before using this tool.
When you have built LLVM, Clang and this tool, you then can test it
with something like this, inside the LLVM build
cd path/to/llvm-build/bin ln /home/james/tooling/build/tooltest ./ ./tooltest -p /home/james/tooling/build /home/james/tooling/src/test.cpp