Update to setuptools-scm 9 makes python-xmlsec unable to be installed

[paulzakin]

Hello!

I am unable to install the newest version of xmlsec when setuptools-scm is v9 or above (released 2025-09-05). I believe this version introduces strict enforcement of PEP 621 configuration rules, and xmlsec's pyproject.toml is non-compliant. Here is the error.

ValueError: pyproject.toml: setuptools-scm is present in
[build-system].requires but dynamic=['version'] is not set in
[project]. Either add dynamic=['version'] to [project] or add a
[tool.setuptools_scm] section.

I believe the fix is to add a [project] section to the pyproject.toml as outlined in their documentation.

Thanks!

[timabbott]

The root issue is pypa/setuptools-scm#1191; it looks like they made a breaking change a bit too early.

[paulzakin]

Thanks for the quick response! Seems like the other issue is the place to follow - I'll close this out :)

[mxamin]

@paulzakin @timabbott Thanks for the info, I'll follow this issue and see how it pans out and update the code if required.