An OCaml installation is required, you can find instructions HERE !
If Ocaml has been installed properly, you should not need to set an installation location in the settings. To verify that Ocaml is properly installed, launch a terminal and type ocaml
, it should let you in the Ocaml interpreter.
This is a requirement for Linux users !
If everything has been set-up correctly, you should see an OCaml version when opening or restarting the interpreter.