From 6f67b4d54dc614cd10d76dadde302120691bf155 Mon Sep 17 00:00:00 2001
From: Vincent Laporte <Vincent.Laporte@gmail.com>
Date: Mon, 6 Oct 2025 22:12:37 +0200
Subject: [PATCH] ocamlPackages.ocf_ppx: fix for OCaml 5.4

---
 pkgs/development/ocaml-modules/ocf/ppx.nix | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/ocaml-modules/ocf/ppx.nix b/pkgs/development/ocaml-modules/ocf/ppx.nix
index a01c36942ea9..891bde287a9d 100644
--- a/pkgs/development/ocaml-modules/ocf/ppx.nix
+++ b/pkgs/development/ocaml-modules/ocf/ppx.nix
@@ -1,4 +1,5 @@
 {
+  fetchpatch,
   buildDunePackage,
   ocf,
   ppxlib,
@@ -10,7 +11,14 @@ buildDunePackage {
 
   inherit (ocf) src version;
 
-  duneVersion = "3";
+  patches = [
+    # Support for ppxlib ≥ 0.37
+    (fetchpatch {
+      url = "https://framagit.org/zoggy/ocf/-/commit/38b1f6420e5c01b3ea6b2fed99b6b62e4c848dc0.patch";
+      hash = "sha256-GymTdK/dOYGianvNIKkl9OhBGW+4dX5TqAkQuEF5FmA=";
+      includes = [ "*.ml" ];
+    })
+  ];
 
   buildInputs = [
     ppxlib