There is an updated pull request by q66 against master on the void-packages repository

https://github.com/q66/void-packages fix-nonportable-sed
https://github.com/void-linux/void-packages/pull/46010

setup/git.sh: fix non-portable sed invocation
This lets xbps-src work in non-GNU environments.

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A patch file from https://github.com/void-linux/void-packages/pull/46010.patch is attached