libledit-ocaml-dev 2.04-4build1 (arm64 binary) in ubuntu focal

 Ledit is a line editor, allowing to use control commands like in emacs
 or in shells (bash, tcsh). To be used with interactive commands. It is
 written in OCaml and Camlp4 and uses the library unix.cma.
 .
 This package ships Ledit as a development library, so that you can use
 it to build interactive programs with line editing capabilities.