To provide an alternate viewpoint, OPAM isn&#x27;t that great of a package manager if you&#x27;ve come from other languages or have used a Linux distro&#x27;s package manager. It&#x27;s incredibly slow, partly because you&#x27;re supposed to use an external constraint solver. When it crashes, it leaves lots of things in an inconsistent state. It&#x27;s environment handling is really picky and gives warnings about not being set up properly even when it is, because it used to (maybe still does) expect itself to be the last thing in a lot of environment variables. It is something I try to avoid when possible.<p>EDIT: Sorry, realized I replied to the wrong comment. Meant to reply to the grandparent.