package camomile

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A Unicode library


Dune Dependency






Camomile is a Unicode library for OCaml. Camomile provides Unicode character type, UTF-8, UTF-16, UTF-32 strings, conversion to/from about 200 encodings, collation and locale-sensitive case mappings, and more. The library is currently designed for Unicode Standard 3.2.

Published: 22 Mar 2023



This is the version 2.0.0 release of Camomile library package. Camomile is a Unicode library for ocaml. Camomile provides Unicode character type, UTF-8, UTF-16, UTF-32 strings, conversion to/from about 200 encodings, collation and locale-sensitive case mappings, and more.

The library is licensed under LGPL-2 with the common linking exception given to OCaml packages. See


The recommended way to install Camomile is via the opam package manager. With the opam binary installed and configured, all you should have to do is:

$ opam install camomile

Otherwise, you might want to see if your distribution has a package available for it.


For developers and testers, dune is used to build the library:

$ dune build

This includes a default library configured with paths internals to dune where its shared files are stored.

The Camomile API provides a functor-base configuration interface that allows to define custom libraries with shared files located at a different location.

If you are building for packaging purposes and need to place shared files in a specific location for the default library, you can use environment variables at build-time:


in which case, the library will look for those files at /usr/share/camomile

Please note that dune install installs the file under the same local directory regardless of this option. This option is meant to be used when packaging the library for distributions using binary packages such as debian or ubuntu packages, RPM package etc.

Using libraries


Camomile requires a runtime configuration to be able to locate its data files.

Camomile's idea of configuration is "configuration by functors". Modules which require configuration become functors parametrized by a module which contains configuration variables. Camomile.Config.Type specifies the module type of configuration parameters. You can pass the configuration module to individual modules' Make (as UCol.Make) or Configure functors (as CharEncoding.Configure), or pass it to the whole-in-one functor Camomile.Make and obtain configured modules.

Camomile provides two top-level modules which contains modules already configured. Therefore it is suitable to use if you are using Camomile locally installed from the source.

Individual modules.

See file.




Camomile is currently maintained by Romain Beauxis and was forked over from the original project with permission from @yoriyuki

However, the project is still in needs of active contributors. Please file pull requests and more!


So many people are contributed to Camomile. See

Before GitHub becomes into existence...

  • Peter Jolly provided CP932 conversion table.

  • Kawakami Shigenobu contributed findlib support.

  • Pierre Chambart contributed StringPrep module.

  • Stanisław T. Findeisen pointed out the balancing bug of AVL-trees.

  • Sylvain Le Gall provided dynamic configuration module

Many people contributed bug fixes.

Dependencies (4)

  1. ocaml >= "4.13"
  2. camlp-streams
  3. dune-site
  4. dune >= "3.4"

Dev Dependencies (2)

  1. odoc with-doc
  2. stdlib-random with-test

Used by (5)

  1. charInfo_width >= "2.0.0"
  2. headache >= "1.07"
  3. liquidsoap-core
  4. soupault >= "4.5.0"
  5. zed >= "3.0.0" & < "3.2.0"