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

https://github.com/sgn/void-packages verify-qt6-private-dep
https://github.com/void-linux/void-packages/pull/50989

hooks/post-install: check for -private-devel if PRIVATE_API is used
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A patch file from https://github.com/void-linux/void-packages/pull/50989.patch is attached