There's a merged pull request on the void-packages repository

mvwm-git: remove
https://github.com/void-linux/void-packages/pull/27439

Description:
- Package is unmaintained upstream
- Thomas Adam is working on fvwm
- mvwm is a clean-up effort of FVWM, but fvwm 3 is out for a long time.

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Close #27436