I just tried it again, everything (m4, dune, opam, ocaml-lsp) installed just fine; then I created a simple hello world project (Quick start guide: https://dune.

I just tried it again, everything (m4, dune, opam, ocaml-lsp) installed just fine; then I created a simple hello world project (Quick start guide: https://dune.readthedocs.io/en/latest/quick-start.html https://dune.readthedocs.io/en/latest/quick-start.html) and I could compile and run it. Oh, how things appear to have changed.