> +(define-public maven-wagon-http-shared
> +  (package
> +    (inherit maven-wagon-provider-api)
[...]
> +       ("maven-wagon-provider-api" ,maven-wagon-provider-api)))

That's some serious abuse of inheritance (compared to the by-the-books sense).
But we are doing that all over the place anyway - maybe not that brazenly, though :)

Have to know when to break "the rules", so LGTM! (O_o)