From b293a401ebcb33b684a6a7156fd1551b63421cb5 Mon Sep 17 00:00:00 2001
From: Vincent Laporte <Vincent.Laporte@gmail.com>
Date: Thu, 20 Apr 2023 06:41:24 +0200
Subject: [PATCH] ocamlPackages.facile: pin Dune version
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and disable for OCaml ≥ 5.0
---
 pkgs/development/ocaml-modules/facile/default.nix | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/ocaml-modules/facile/default.nix b/pkgs/development/ocaml-modules/facile/default.nix
index 3eab7d3417f..488a7d151d1 100644
--- a/pkgs/development/ocaml-modules/facile/default.nix
+++ b/pkgs/development/ocaml-modules/facile/default.nix
@@ -1,5 +1,8 @@
 { lib, fetchurl, buildDunePackage, ocaml }:
 
+lib.throwIf (lib.versionAtLeast ocaml.version "5.0")
+  "facile is not available for OCaml ≥ 5.0"
+
 buildDunePackage rec {
   pname = "facile";
   version = "1.1.4";
@@ -11,8 +14,8 @@ buildDunePackage rec {
 
   doCheck = true;
 
-  useDune2 = lib.versionAtLeast ocaml.version "4.12";
-  postPatch = lib.optionalString useDune2 "dune upgrade";
+  duneVersion = if lib.versionAtLeast ocaml.version "4.12" then "2" else "1";
+  postPatch = lib.optionalString (duneVersion != "1") "dune upgrade";
 
   meta = {
     homepage = "http://opti.recherche.enac.fr/facile/";