Change:
<del> <section xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-language-ocaml"> <title>OCaml</title> <para> OCaml libraries should be installed in <literal>$(out)/lib/ocaml/${ocaml.version}/site-lib/</literal>. Such directories are automatically added to the <literal>$OCAMLPATH</literal> environment variable when building another package that depends on them or when opening a <literal>nix-shell</literal>. </para> <para> Given that most of the OCaml ecosystem is now built with dune, nixpkgs includes a convenience build support function called <literal>buildDunePackage</literal> that will build an OCaml package using dune, OCaml and findlib and any additional dependencies provided as <literal>buildInputs</literal> or <literal>propagatedBuildInputs</literal>. </para> <para> Here is a simple package example. It defines an (optional) attribute <literal>minimumOCamlVersion</literal> that will be used to throw a descriptive evaluation error if building with an older OCaml is attempted. It uses the <literal>fetchFromGitHub</literal> fetcher to get its source. It sets the <literal>doCheck</literal> (optional) attribute to <literal>true</literal> which means that tests will be run with <literal>dune runtest -p angstrom</literal> after the build (<literal>dune build -p angstrom</literal>) is complete. It uses <literal>alcotest</literal> as a build input (because it is needed to run the tests) and <literal>bigstringaf</literal> and <literal>result</literal> as propagated build inputs (thus they will also be available to libraries depending on this library). The library will be installed using the <literal>angstrom.install</literal> file that dune generates. </para> <programlisting> { stdenv, fetchFromGitHub, buildDunePackage, alcotest, result, bigstringaf }: buildDunePackage rec { pname = "angstrom"; version = "0.10.0"; minimumOCamlVersion = "4.03"; src = fetchFromGitHub { owner  = "inhabitedtype"; repo   = pname; rev    = version; sha256 = "0lh6024yf9ds0nh9i93r9m6p5psi8nvrqxl5x7jwl13zb0r9xfpw"; }; buildInputs = [ alcotest ]; propagatedBuildInputs = [ bigstringaf result ]; doCheck = true; meta = { homepage = "https://github.com/inhabitedtype/angstrom"; description = "OCaml parser combinators built for speed and memory efficiency"; license = stdenv.lib.licenses.bsd3; maintainers = with stdenv.lib.maintainers; [ sternenseemann ]; }; } </programlisting> <para> Here is a second example, this time using a source archive generated with <literal>dune-release</literal>. It is a good idea to use this archive when it is available as it will usually contain substituted variables such as a <literal>%%VERSION%%</literal> field. This library does not depend on any other OCaml library and no tests are run after building it. </para> <programlisting> { stdenv, fetchurl, buildDunePackage }: buildDunePackage rec { pname = "wtf8"; version = "1.0.1"; minimumOCamlVersion = "4.01"; src = fetchurl { url = "https://github.com/flowtype/ocaml-${pname}/releases/download/v${version}/${pname}-${version}.tbz"; sha256 = "1msg3vycd3k8qqj61sc23qks541cxpb97vrnrvrhjnqxsqnh6ygq"; }; meta = with stdenv.lib; { homepage = "https://github.com/flowtype/ocaml-wtf8"; description = "WTF-8 is a superset of UTF-8 that allows unpaired surrogates."; license = licenses.mit; maintainers = [ maintainers.eqyiel ]; }; } </programlisting> </section> </del>

Discussion:
This issue tracks the conversion of from Docbook to CommonMark per . If you intend to work on this conversion, please comment below! here that you intend to work on it. (Please also post if you stop working on it.) a new branch of nixpkgs master. : change to . to . the contents from Docbook to . Follow . Use existing sections for inspiration. from the folder to build the manual. the manual on your computer at after running from folder: it looks good, submit a PR and reference this issue.
Done!

This issue tracks the conversion of from Docbook to Commonmark per . If you intend to work on this conversion, please comment below! in this issue that you intend to work on it. (Please also post if you stop working on it) a new branch of nixpkgs master. : change to . to . the contents from Docbook to . Follow . Use existing sections for inspiration. from the folder to build the manual. the manual on your computer at after running from folder: it looks good, submit a PR and reference this issue.
Done!