[Bug] Build failure caused by ttkthemes 3.3.0 metadata issue (project.license error)

[Eorrik]

Description I encountered a crash when running the environment setup/update script using uv on Windows. The process fails when building ttkthemes.

The error message indicates a configuration error in ttkthemes 3.3.0 regarding the project.license field, which is rejected by modern build backends (like recent setuptools used by uv).

Error Log

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configuration error: project.license must be valid exactly by one definition (2 matches found):
...
GIVEN VALUE: "GPL-3.0-or-later"
OFFENDING RULE: 'oneOf'
Cause Analysis The current dependency seems to be defined as ttkthemes~=3.2.0 (or similar), which allows pip/uv to automatically install the newly released 3.3.0 version. However, version 3.3.0 contains invalid metadata that breaks the build process on stricter environments.

Solution / Workaround I successfully fixed this issue locally by pinning the version to 3.2.0.

I suggest changing the dependency in requirements.txt (or pyproject.toml) from:

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ttkthemes~=3.2.0
to:

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ttkthemes==3.2.0
This will prevent the installer from pulling the broken 3.3.0 version until the upstream library fixes their metadata.

Environment

OS: Windows

Installer: uv

[nishimura5]

Thank you for the detailed report and for digging into the root cause! Also, thanks for sharing the workaround of pinning ttkthemes – that’s very helpful.
At the moment, I haven’t yet had a chance to try reproducing the issue in my local environment but based on your description it does look like a metadata problem in ttkthemes 3.3.0 when used with more strict build backends.

As a practical workaround, I’m planning to update the dependency as follows:

• On the master branch
  Change:
  ttkthemes~=3.2.0
  To:
  ttkthemes==3.2.2
  Thanks again for your help with this issue!