Okay tried opam2nix again, no dice…
https://gitlab.com/NobbZ/ocaml2nix-hello-example fails due to OCAMLTOP_INCLUDE_PATH: unbound variable when building dune, running nix-build directly in the examples/simple dir of opam2nix gives me OCAMLPATH: unbound variable when building cppo.
The linked repository of mine, just tries to mimick what the mentioned example does anyway, differences I am aware of, is that I want to use a more recent version of OCaml and I have resolved at a later point in time, both might lead to a different opam-selection.
Can someone help me figuring this out? Or should I go and open a ticket at opam2nix repo? Create a new thread here?