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

Merge pull request #2314 from OCamlPro/fix-reinst

Fixed forgetting some package reinstallations
latest commit ff0fa0f642
@AltGr AltGr authored
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admin-scripts to_1_1 script: fixed filtering with unknown variables
doc More documentation for external solvers
m4 remove caml4boot from the test, as its not used and sometimes (on Deb…
shell Fix mkdir in install script
src Fixed forgetting some package reinstallations
src_ext MD5 sum for dose 3.3 changed
tests Fix tests for added compilers-packages precondition
.gitignore Typo
.merlin Add a merlin file.
.ocp-indent Make --dry-run a real dry-run, and add --show to check the update update Travis scripts
.travis.yml update Travis scripts
AUTHORS Add note on OpamVersionCompare (from dose) copyright
CHANGES Updated CHANGES update CONTRIBUTING to ask for `opam config report`
LICENSE A few copyright and license fixes Clean up declared library dependencies and META
Makefile Merge pull request #2183 from struktured/cygwin-fixes Clean up declared library dependencies and META
OCamlMakefile Makefile: fix dependencies calculation Add note on OpamVersionCompare (from dose) copyright
appveyor.yml Fix Appveyor Cygwin mirror
configure Clean up declared library dependencies and META Clean up declared library dependencies and META
opam Sync local `opam` file with opam-repository
opam-devel.opam Bump version to 1.3.0~dev
opam.install Don't install manpages for command aliases

OPAM - A 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.

OPAM was created and is maintained by OCamlPro.

To get started, checkout the Install and Usage guides.

Compiling this repo

  • Make sure you have OCaml and GNU make installed. If you don't have a recent enough version of OCaml (>= 3.12.1) at hand, see the next paragraph.
  • Run ./configure
  • Run make lib-ext as advertised by ./configure if you don't have the dependencies installed and only need the opam binary (not the libs). This will locally take care of all OCaml dependencies for you.
  • Otherwise, make sure to have ocamlfind, ocamlgraph, cmdliner, jsonm, cudf, dose 3.2.2+opam and re >= 1.2.0 installed. Or run opam install opam-lib --deps-only if you already have a working instance. Re-run ./configure once done.
  • Run make
  • Run make install
  • Run make libinstall if needed (this is incompatible with make lib-ext, as the opam library would conflict with installed versions of the dependencies)

Compiling without OCaml

make cold is provided as a facility to compile OCaml, then bootstrap OPAM. You don't need need to run ./configure in that case, but you may specify CONFIGURE_ARGS if needed, e.g.:

make cold CONFIGURE_ARGS="--prefix ~/local"

NOTE: You'll still need GNU make.

Bug tracker

Have a bug or a feature request ? Please open an issue on our bug-tracker. Please search for existing issues before posting, and include the output of opam config report and any details that may help track down the issue.


User Manual

The main documentation entry point to OPAM is the user manual, available using opam --help. To get help for a specific command, use opam <command> --help.

Guides and Tutorials

A collection of guides and tutorials is available online. They are generated from the files in doc/pages.

API, Code Documentation and Developer Manual

A more thorough technical document describing OPAM and specifying the package description format is available in the developer manual. make doc will otherwise make the API documentation available under doc/.


Keep track of development and community news.

  • Have a question that's not a feature request or bug report? Ask on the mailing list.

  • Chat with fellow OPAMers on IRC. On the server, in the #ocaml or the #opam channel.


We welcome contributions ! Please use Github's pull-request mechanism against the master branch of the OPAM repository. If that's not an option for you, you can use git format-patch and email TODO.


The release cycle respects Semantic Versioning.

Related repositories

  • ocaml/opam-repository is the official repository for OPAM packages and compilers. A number of non-official repositories are also available on the interwebs, for instance on Github.
  • opam2web generates a collection of browsable HTML files for a given repository. It is used to generate
  • opam-rt is the regression framework for OPAM.
  • opam-publish is a tool to facilitate the creation, update and publication of OPAM packages.

Copyright and license

The version comparison function in src/core/ is part of the Dose library and Copyright 2011 Ralf Treinen.

All other code is:

Copyright 2012-2015 OCamlPro Copyright 2012 INRIA

All rights reserved. OPAM is distributed under the terms of the GNU Lesser General Public License version 3.0.

OPAM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

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