There is a new pull request by paper42 against master on the void-packages repository

https://github.com/paper42/void-packages remove-ocaml-lablgtk
https://github.com/void-linux/void-packages/pull/39065

ocaml-lablgtk2: remove package
gtk2, not used by any other packages

gtk3 version exists, but it would be called ocaml-lablgtk3, so an update doesn't make sense

A patch file from https://github.com/void-linux/void-packages/pull/39065.patch is attached