There is an updated pull request by sgn against master on the void-packages repository

https://github.com/sgn/void-packages nix-sane-build
https://github.com/void-linux/void-packages/pull/39050

nix: do not touch outside {build,dest}dir
While we're at it, cross compile

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A patch file from https://github.com/void-linux/void-packages/pull/39050.patch is attached