Dune preview install new package

Hi there,

I’m quite new to OCaml and I’m rooting for https://preview.dune.build/
Knowing very little about anything really I cannot figure out how to install and actual dependency.

I think I’m looking for the npm install foo equivalent in the new dune world.

I created a project using dune init project my_name.
And now I’d like to play around with ppx_deriving.
Their GitHub says opam install ppx_deriving, so I thought dune install ppx_deriving would do the trick but nothing happens:

Error: Unknown package ppx_deriving!

I also updated my bin/main.ml to

type coord = { x : int; y : int }

let () = print_endline "Hello, World!"

This now does not compile:

dune build:

File "bin/main.ml", line 1, characters 0-33:
1 | type coord = { x : int; y : int }
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error (warning 34 [unused-type-declaration]): unused type coord.

File "bin/main.ml", line 1, characters 15-23:
1 | type coord = { x : int; y : int }
                   ^^^^^^^^
Error (warning 69 [unused-field]): unused record field x.

File "bin/main.ml", line 1, characters 24-31:
1 | type coord = { x : int; y : int }
                            ^^^^^^^
Error (warning 69 [unused-field]): unused record field y.

This is all rather strict, can I treat this warning as a warning?

Lastly, what do I tell the ocaml vscode extension:

The current Merlin configuration has been generated by another, incompatible, version of Dune. Please rebuild the project. (Using the same version of Dune as the one running the 'ocaml-merlin' server.)ocamllsp

Does anyone have any pointers?

Cheers!

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