I am facing the problem that I want to use Ocaml 4.08, but the base package in nixpkgs (1.11.1) is incompatible with 4.08.

I wanted to use a local overlay to bump it to 1.13, but it would not get picked up by other packages, and the reason seems to be that the package set in https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/ocaml-modules/janestreet/default.nix is a simple rec, and does not take part in the global fixed-point of nix packages. Shouln’t this file take base as a parameter and not be a rec set?

Is that intentionally or was it just an oversight? @vbgl?