From e04155ad5917ba342693360e6f46d10d9e4b7e32 Mon Sep 17 00:00:00 2001
From: Gaetan Lepage <gaetan@glepage.com>
Date: Thu, 28 May 2026 20:36:07 +0000
Subject: [PATCH] opencv: fix on cuda 13.2

---
 pkgs/development/libraries/opencv/4.x.nix | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/libraries/opencv/4.x.nix b/pkgs/development/libraries/opencv/4.x.nix
index 3e81c8a5b008..8898754b7a72 100644
--- a/pkgs/development/libraries/opencv/4.x.nix
+++ b/pkgs/development/libraries/opencv/4.x.nix
@@ -3,6 +3,7 @@
   stdenv,
   fetchurl,
   fetchFromGitHub,
+  fetchpatch,
   cmake,
   pkg-config,
   unzip,
@@ -300,9 +301,21 @@ effectiveStdenv.mkDerivation {
     ./cmake-don-t-use-OpenCVFindOpenEXR.patch
     ./0001-cmake-OpenCVUtils.cmake-invalidate-Nix-store-paths-b.patch
   ]
-  ++ optionals enableCuda [
-    ./cuda_opt_flow.patch
-  ];
+  ++ optionals enableCuda (
+    [
+      ./cuda_opt_flow.patch
+    ]
+    ++ optionals (cudaPackages.cudaAtLeast "13.2") [
+      # Backport https://github.com/opencv/opencv_contrib/pull/4097
+      (fetchpatch {
+        name = "fix-cuda-13-2-compat";
+        url = "https://github.com/opencv/opencv_contrib/commit/f2854f4f5e7b67d4e073ea002ae0174d437e2962.patch";
+        stripLen = 2;
+        extraPrefix = "opencv_contrib/";
+        hash = "sha256-nJqPT3gvqTTKFDR9uTFR/7gummlpz1Dw+UQ4EWPfqOA=";
+      })
+    ]
+  );
 
   postPatch =
     # This prevents cmake from using libraries in impure paths (which