> check pyproject.toml, setup.cf, setup.py for anyreference of expected build backend (flit-core, hatcling, pdm-backend, poetry-core, setuptools) and add it to native-inputs of failing package.

Hi Sharlatan, 

Thanks for the reply and information.

Should we refactor to have a pyproject-build-system/setuptools, pyproject-build-system/poetry-core, pyproject-build-system/flit-core, pyproject-build-system/hatchling, etc abstractions in the future or something else?

all best,

jgart