libutop-ocaml-dev 2.4.3-1build1 (armhf binary) in ubuntu focal

 utop is an improved toplevel for OCaml. It can run in a terminal or
 in Emacs. It supports line edition, history, real-time and context
 sensitive completion, colors, and more.
 .
 This package contains the development stuff needed to use the
 utop library in your programs.