From 8ede16564f5479675b60cd3a82a2a59edb0c2184 Mon Sep 17 00:00:00 2001
From: Vincent Laporte <Vincent.Laporte@gmail.com>
Date: Wed, 22 Mar 2023 06:12:11 +0100
Subject: [PATCH] ocamlPackages.bigstring: use Dune 3 & fix for OCaml 5

---
 pkgs/development/ocaml-modules/bigstring/default.nix | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/ocaml-modules/bigstring/default.nix b/pkgs/development/ocaml-modules/bigstring/default.nix
index f966e0b90b1..650522363d3 100644
--- a/pkgs/development/ocaml-modules/bigstring/default.nix
+++ b/pkgs/development/ocaml-modules/bigstring/default.nix
@@ -1,12 +1,16 @@
-{ lib, fetchFromGitHub, buildDunePackage }:
+{ lib, fetchFromGitHub, buildDunePackage, ocaml }:
 
 buildDunePackage rec {
   pname = "bigstring";
   version = "0.3";
 
-  useDune2 = true;
+  duneVersion = "3";
+  minimalOCamlVersion = "4.03";
 
-  minimumOCamlVersion = "4.03";
+  # Ensure compatibility with OCaml ≥ 5.0
+  preConfigure = lib.optional (lib.versionAtLeast ocaml.version "4.08") ''
+    substituteInPlace src/dune --replace '(libraries bytes bigarray)' ""
+  '';
 
   src = fetchFromGitHub {
     owner = "c-cube";