devel/ocaml-opam: Source-based package manager for OCaml

OPAM is a source-based package manager for OCaml. It supports multiple
simultaneous compiler installations, flexible package constraints, and
a Git-friendly development workflow.

WWW: http://opam.ocamlpro.com/index.html

PR: ports/179462
Submitted by: Joris Giovannangeli <joris.gio@gmail.com>