This image is based on Alpine Linux image, which is only a 5MB image, and contains OCaml compiler.
Download size of this image is only:
$ echo 'print_string "Hello, World!";;' > qq.ml
$ docker run --rm -v "$(pwd):/tmp" frolvlad/alpine-ocaml ocamlopt -cclib --static /tmp/qq.ml -o /tmp/qq
Once you have run these commands you will have qq
executable in your current directory and if you
execute it, you will get printed 'Hello, World!'