## Describe the bug When setting `PYTHON_EXTRA_DEPS` on a project using a `pyproject.toml`, the `pip install` fails with: ``` ERROR: [dependency-groups] table was missing from 'pyproject.toml'. Cannot resolve '--group' option. ``` The project still declares its extra dependencies in section `[project.optional-dependencies]`. ## Expected behavior As declared as an extra deps (`PYTHON_EXTRA_DEPS: dev`), I expect the command is `pip install .[dep]`. (Finally add any possible additional useful context info here.)