It does also need the upstream PR in OCaml to be merged first!

Rebased and added Changes entry to 2.9.4 (is it correct that it goes in the 2.9.4 section with PR number for main?).

The OCaml PR for this is about to be merged.

The flambda-backend compiler is planning to integrate ocaml/ocaml#11198 on a 4.14 branch, so we'd like some support for that in dune too. I've got a patch which more or less lowers the version bound for the code of this PR to 4.14, which should work because using the new code on a vanilla 4.14 compiler will still produce the expected result.
Should I submit this patch as a pull request ?

Presumably it also has to check for the files in two locations for the exists_if tests? Regardless, a PR with the patch seems the way to go, yes.

Could you point me to the exists_if tests in question ? I have patched the check for natdynlink support, but I haven't seen any other place where this was relevant.