As I understand it, dune is the build tool for OCaml projects.
But when I try
$ opam install dune
[ERROR] No package named dune found.
$ opam install jbuilder
[NOTE] Package jbuilder is already installed (current version is 1.0+beta20).
$ ocaml --version
The OCaml toplevel, version 4.06.0
help? what am I missing? I thought dune was released recently, and is the recommended way forward.