core/pkgs/build-support/ocaml/oasis.nix

{
  lib,
  stdenv,
  ocaml_oasis,
  ocaml,
  findlib,
  ocamlbuild,
}:

{
  pname,
  version,
  nativeBuildInputs ? [ ],
  meta ? {
    platforms = ocaml.meta.platforms or [ ];
  },
  minimumOCamlVersion ? null,
  createFindlibDestdir ? true,
  dontStrip ? true,
  ...
}@args:

if args ? minimumOCamlVersion && lib.versionOlder ocaml.version args.minimumOCamlVersion then
  throw "${pname}-${version} is not available for OCaml ${ocaml.version}"
else

  stdenv.mkDerivation (
    args
    // {
      name = "ocaml${ocaml.version}-${pname}-${version}";

      nativeBuildInputs = [
        ocaml
        findlib
        ocamlbuild
        ocaml_oasis
      ] ++ nativeBuildInputs;

      inherit createFindlibDestdir;
      inherit dontStrip;

      strictDeps = true;

      buildPhase = ''
        runHook preBuild
        oasis setup
        ocaml setup.ml -configure --prefix $OCAMLFIND_DESTDIR --exec-prefix $out
        ocaml setup.ml -build
        runHook postBuild
      '';

      checkPhase = ''
        runHook preCheck
        ocaml setup.ml -test
        runHook postCheck
      '';

      installPhase = ''
        runHook preInstall
        mkdir -p $out
        ocaml setup.ml -install
        runHook postInstall
      '';

    }
  )