> -(define-public ocaml4.07-gen
> +(define-public ocaml-gen
>    [...]
>     `(#:tests? #f; no tests
> -       #:package "gen"
> -       #:ocaml ,ocaml-4.07
> -       #:findlib ,ocaml4.07-findlib
> -       #:dune ,ocaml4.07-dune))
> +       #:package "gen"))
>      (propagated-inputs
> -     `(("ocaml-odoc" ,(package-with-ocaml4.07 ocaml4.07-odoc))))
> +     `(("ocaml-odoc" ,ocaml-odoc)))
>      (native-inputs
> -     `(("ocaml-qtest" ,(package-with-ocaml4.07 ocaml-qtest))
> -       ("ocaml-qcheck" ,(package-with-ocaml4.07 ocaml-qcheck))))
> +     `(("ocaml-qtest" ,ocaml-qtest)
> +       ("ocaml-qcheck" ,ocaml-qcheck)))

I'm confused what's going on here.
ocaml-qtest is for unit tests (https://opam.ocaml.org/packages/qtest/qtest.2.1.0/),
but for this package we have ‘#:tests? #f; no tests?’?
That seems contradictory.

Greetings,
Maxime.