From df96a914b43b683d6633baff01d86096309e3ec8 Mon Sep 17 00:00:00 2001
From: Vincent Laporte <Vincent.Laporte@gmail.com>
Date: Thu, 26 Mar 2026 17:59:19 +0100
Subject: [PATCH] ocamlPackages.atdml: init at 4.0.0

---
 .../ocaml-modules/atdgen/runtime.nix          |  2 --
 .../ocaml-modules/atdml/default.nix           | 21 +++++++++++++++++++
 pkgs/top-level/ocaml-packages.nix             |  2 ++
 3 files changed, 23 insertions(+), 2 deletions(-)
 create mode 100644 pkgs/development/ocaml-modules/atdml/default.nix

diff --git a/pkgs/development/ocaml-modules/atdgen/runtime.nix b/pkgs/development/ocaml-modules/atdgen/runtime.nix
index 4531dce25bb9..9da7797462b7 100644
--- a/pkgs/development/ocaml-modules/atdgen/runtime.nix
+++ b/pkgs/development/ocaml-modules/atdgen/runtime.nix
@@ -9,8 +9,6 @@ buildDunePackage {
   pname = "atdgen-runtime";
   inherit (atdgen-codec-runtime) version src;
 
-  minimalOCamlVersion = "4.08";
-
   propagatedBuildInputs = [
     biniou
     yojson
diff --git a/pkgs/development/ocaml-modules/atdml/default.nix b/pkgs/development/ocaml-modules/atdml/default.nix
new file mode 100644
index 000000000000..1b45f276222b
--- /dev/null
+++ b/pkgs/development/ocaml-modules/atdml/default.nix
@@ -0,0 +1,21 @@
+{
+  lib,
+  buildDunePackage,
+  atd,
+  cmdliner,
+}:
+
+buildDunePackage {
+  pname = "atdml";
+  inherit (atd) version src;
+
+  buildInputs = [ cmdliner ];
+
+  propagatedBuildInputs = [ atd ];
+
+  meta = atd.meta // {
+    description = "Simplified OCaml JSON serializers using the Yojson AST";
+    maintainers = [ lib.maintainers.vbgl ];
+    mainProgram = "atdml";
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 95a89ab20a77..e979158c72a1 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -76,6 +76,8 @@ let
 
         atdgen-runtime = callPackage ../development/ocaml-modules/atdgen/runtime.nix { };
 
+        atdml = callPackage ../development/ocaml-modules/atdml { };
+
         augeas = callPackage ../development/ocaml-modules/augeas {
           inherit (pkgs) augeas;
         };