There is a new pull request by sgn against master on the void-packages repository

https://github.com/sgn/void-packages boinc-no-gtk+2
https://github.com/void-linux/void-packages/pull/39481

boinc: not depends on GTK+ anymore
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#### Testing the changes
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A patch file from https://github.com/void-linux/void-packages/pull/39481.patch is attached