sci-libs/cartopy-0.21.1 has: BDEPEND=" $(python_gen_cond_dep ' dev-python/setuptools_scm_git_archive[${PYTHON_USEDEP}] since 0.21 and "Remove use of setuptools_scm_git_archive": https://github.com/SciTools/cartopy/commit/76c4d78441c51944fbaa48006eb6ce426f3e0344 The requirement is: setuptools_scm >= 7.0.0
Thanks for the hint. Fixed ebuild is in tree now.