Tried following the README instructions, but this step failed:
git submodule update --init
Submodule 'libffi' (https://github.com/NativeScript/libffi.git) registered for path 'libffi'
fatal: No url found for submodule path 'v8' in .gitmodules
git submodule status
-5f28db3ee282b130f04776638f2ba7b890c3169d libffi
fatal: no submodule mapping found in .gitmodules for path 'v8'
Seems to reflect the state of the repo too:
Unless this is yet another private repo..?