ocaml-mode 4.05.0-10ubuntu1 (s390x binary) in ubuntu bionic

 Objective (OCaml) is an implementation of the ML language, based on
 the Caml Light dialect extended with a complete class-based object system
 and a powerful module system in the style of Standard ML.
 .
 This package provides support for editing both Objective Caml and
 Caml Light programs with Emacs and XEmacs.
 .
 Caml-mode supports:
  - indentation
  - compilation and error retrieving
  - interaction with the toplevel
  - font-lock
  - imenu