This follows the convention of providing our own CMake files in the tnt folder(s) and successfully builds with the -i option (install).
This folder was created as follows:
cd third_party
git clone https://github.com/OpenImageDenoise/oidn.git OpenImageDenoise
cd OpenImageDenoise
git submodule init
git submodule update
find . -name ".git*" | xargs rm -rf
find . -name "*.pdf" | xargs rm -rf