ocamlPackages: default to version 3 of Dune

pkgs/build-support/ocaml/dune.nix

···
 { pname, version, nativeBuildInputs ? [], enableParallelBuilding ? true, ... }@args:
 
 let Dune =
-  let dune-version = args.duneVersion or "2"; in
+  let dune-version = args.duneVersion or "3"; in
   { "1" = dune_1; "2" = dune_2; "3" = dune_3; }."${dune-version}"
 ; in
 

pkgs/development/ocaml-modules/dune-build-info/default.nix

···
-{ lib, buildDunePackage, dune_2, dune-action-plugin }:
+{ lib, buildDunePackage, dune-action-plugin }:
 
 buildDunePackage rec {
   pname = "dune-build-info";
-  inherit (dune_2) src version patches;
-
-  useDune2 = true;
+  inherit (dune-action-plugin) src version preBuild;
 
   dontAddPrefix = true;
 
   buildInputs = [ dune-action-plugin ];
 
   meta = with lib; {
-    inherit (dune_2.meta) homepage;
+    inherit (dune-action-plugin.meta) homepage;
     description = "Embed build information inside executables";
     maintainers = [ maintainers.bcdarwin ];
     license = licenses.mit;

pkgs/development/ocaml-modules/dune-configurator/default.nix

···
-{ lib, buildDunePackage, dune_2, csexp, result }:
+{ lib, buildDunePackage, dune_3, csexp }:
 
 buildDunePackage rec {
   pname = "dune-configurator";
 
-  inherit (dune_2) src version patches;
+  inherit (dune_3) src version patches;
 
-  duneVersion = "2";
+  # This fixes finding csexp
+  postPatch = ''
+    rm -rf vendor/pp vendor/csexp
+  '';
 
-  minimalOCamlVersion = "4.03";
+  minimalOCamlVersion = "4.05";
 
   dontAddPrefix = true;
 
-  propagatedBuildInputs = [ csexp result ];
+  propagatedBuildInputs = [ csexp ];
 
   meta = with lib; {
     description = "Helper library for gathering system configuration";

pkgs/development/ocaml-modules/lame/default.nix

···
   pname = "lame";
   version = "0.3.6";
 
-  minimalOCamlVersion = "4.03";
+  minimalOCamlVersion = "4.06";
 
   src = fetchFromGitHub {
     owner = "savonet";

pkgs/development/ocaml-modules/lo/default.nix

···
   pname = "lo";
   version = "0.2.0";
 
+  minimalOCamlVersion = "4.06";
+
   src = fetchFromGitHub {
     owner = "savonet";
     repo = "ocaml-lo";

pkgs/development/ocaml-modules/ocaml-gettext/stub.nix

···
 
   inherit (ocaml_gettext) src version;
 
+  minimalOCamlVersion = "4.06";
+
   buildInputs = [ dune-configurator ];
 
   propagatedBuildInputs = [ ocaml_gettext ];

pkgs/development/ocaml-modules/ounit2/default.nix

···
 { lib, ocaml, buildDunePackage, fetchurl, seq, stdlib-shims, ncurses }:
 
-buildDunePackage rec {
+buildDunePackage (rec {
   minimalOCamlVersion = "4.04";
 
   pname = "ounit2";
   version = "2.2.6";
-
-  duneVersion = if lib.versionAtLeast ocaml.version "4.08" then "2" else "1";
 
   src = fetchurl {
     url = "https://github.com/gildor478/ounit/releases/download/v${version}/ounit-${version}.tbz";
···
     license = licenses.mit;
     maintainers = with maintainers; [ sternenseemann ];
   };
-}
+} // lib.optionalAttrs (!lib.versionAtLeast ocaml.version "4.08") {
+  duneVersion = "1";
+})

pkgs/development/ocaml-modules/shine/default.nix

···
   pname = "shine";
   version = "0.2.3";
 
-  duneVersion = "2";
-
   src = fetchFromGitHub {
     owner = "savonet";
     repo = "ocaml-shine";

pkgs/development/tools/ocaml/js_of_ocaml/ocamlbuild.nix

···
   pname = "js_of_ocaml-ocamlbuild";
   version = "5.0";
 
-  minimalOCamlVersion = "4.02";
+  minimalOCamlVersion = "4.03";
 
   src = fetchurl {
     url = "https://github.com/ocsigen/js_of_ocaml-ocamlbuild/releases/download/${version}/js_of_ocaml-ocamlbuild-${version}.tbz";