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+opam - OCaml Package Manager
+OPAM is a source-based package manager for OCaml. It supports
+multiple simultaneous compiler installations, flexible package
+constraints, and a Git-friendly development workflow.
+Managing your OCaml installation can be as simple as:
+ opam list -a # List the available packages
+ opam install lwt # Install LWT
+ opam update # Update the package list
+ ...
+ opam upgrade # Upgrade the installed packages to their latest version
+It has to be initialized. To do it, you can use the following command:
+opam init
+It is not recommended to run opam from root. Apparently it installs per-user packages.