How to dunify project that uses volt

I’m a little confused about the dependencies of the modules involved.

--hello.ml--
let foo = "bar" in
  INFO_MSG "msg %s" foo;

--dune--
(executable
 (name hello)
 (preprocess (action (run camlp4 -I /usr/lib/ocaml/camlp4 -I /home/me/.opam/default/lib/volt -parser o -parser op -printer p bolt_pp.cmo %{input-file})))
 (libraries volt threads dynlink))

$> dune build ./hello.exe
Error: No implementations provided for the following modules:
         Dynlink referenced from /home/me/.opam/default/lib/volt/bolt.cmxa(Bolt)
         Thread referenced from /home/me/.opam/default/lib/volt/boltThread.cmx
         Mutex referenced from /home/me/.opam/default/lib/volt/boltThread.cmx
         Unix referenced from /home/me/.opam/default/lib/volt/bolt.cmxa(Bolt)

Am I doing something wrong?

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