From 5c603601b15d623b195c7f819cb030443c7de7e3 Mon Sep 17 00:00:00 2001
From: Vincent Laporte <Vincent.Laporte@gmail.com>
Date: Wed, 14 Jan 2026 06:42:32 +0100
Subject: [PATCH] ocamlPackages.owl: fix for GCC 15

---
 .../ocaml-modules/owl-base/default.nix        | 22 ++++++++++++++-----
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/pkgs/development/ocaml-modules/owl-base/default.nix b/pkgs/development/ocaml-modules/owl-base/default.nix
index 864a3fa5b870..a9c1b14af8b6 100644
--- a/pkgs/development/ocaml-modules/owl-base/default.nix
+++ b/pkgs/development/ocaml-modules/owl-base/default.nix
@@ -2,17 +2,27 @@
   lib,
   buildDunePackage,
   fetchurl,
+  fetchpatch,
+  applyPatches,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "owl-base";
   version = "1.2";
 
-  duneVersion = "3";
+  src = applyPatches {
+    src = fetchurl {
+      url = "https://github.com/owlbarn/owl/releases/download/${finalAttrs.version}/owl-${finalAttrs.version}.tbz";
+      hash = "sha256-OBei5DkZIsiiIltOM8qV2mgJJGmU5r8pGjAMgtjKxsU=";
+    };
 
-  src = fetchurl {
-    url = "https://github.com/owlbarn/owl/releases/download/${version}/owl-${version}.tbz";
-    hash = "sha256-OBei5DkZIsiiIltOM8qV2mgJJGmU5r8pGjAMgtjKxsU=";
+    patches = [
+      # Compatibility with GCC 15
+      (fetchpatch {
+        url = "https://github.com/owlbarn/owl/commit/3e66ccb0b1d21b73fa703f3d3f416ec0107860a4.patch";
+        hash = "sha256-0bV0ogTvtDoO8kEvE5QcJFRWqOJ1qiXGjXY9Ekp30M0=";
+      })
+    ];
   };
 
   minimalOCamlVersion = "4.10";
@@ -25,4 +35,4 @@ buildDunePackage rec {
     maintainers = [ lib.maintainers.bcdarwin ];
     license = lib.licenses.mit;
   };
-}
+})