There's no reason not to use the latest release. Could you scnd an updated patch for the latest release, with a comment saying future versions will use dune?

There seem to be some whitespace issues with your patch. Tabs?

Le 9 décembre 2020 09:58:35 GMT-05:00, divoplade <d@divoplade.fr> a écrit :
>Dear guix,
>
>I want to have js_of_ocaml into guix. Here is a dependency of it,
>reactiveData. It is a simple package, but the build system changed from
>ocaml-build-system to dune-build-system between the last release and
>now, so I think we should use the latest commit.
>
>Best regards,
>
>divoplade