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

mate-themes: Don't pull gtk+ in
https://github.com/void-linux/void-packages/pull/38832

Description:
It's suck to pull the whole gtk+ in just to use Mate,
which is GTK+3 only.

This is not about minimalism or whatsoever, I just want to keep my system away from GTK+

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