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OPAM - A package manager for OCaml

OPAM is a package manager for OCaml, based on the CUDF library developped by the Mancoosi project, which is, among other things, used by Debian to manage their packages.


  • ocaml

Compiling OPAM

  • To compile opam, simply run:

This will fetch the necessary archives if they are not already downloaded and then build OPAM. If you just want to get the necessary dependencies without compiling the project, run make clone.

Using opam

All of the OPAM state is held in the ~\.opam directory in your home directory, including compiler installations. You should never need to switch to a root user to install packages. Package listings are obtained through remote sources.

opam init
eval `opam config -env`

The first command creates ~\.opam and set-up as default repository. The second command update your local environment to use the packages installed by OPAM. For convenience, you can add this line in your ~/.profile.

opam list

As expected, this command lists all the available packages. We can now install some packages (for instance lwt):

opam install lwt


Some technical documentations are available in doc:

  • the API is available in doc/html/
  • The design documents are available in doc/specs/
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