From fbced4e70d4663a5b5c7c317fe4dfe899c6b8d66 Mon Sep 17 00:00:00 2001
From: Melody Kelly <melody@melody.blue>
Date: Sun, 2 Mar 2025 19:46:53 +1000
Subject: [PATCH] opencv: use c++ 17 to fix protobuf support

fixes #386327
---
 pkgs/development/libraries/opencv/4.x.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkgs/development/libraries/opencv/4.x.nix b/pkgs/development/libraries/opencv/4.x.nix
index dd9a3fd73bb2e..bb187a70b3959 100644
--- a/pkgs/development/libraries/opencv/4.x.nix
+++ b/pkgs/development/libraries/opencv/4.x.nix
@@ -417,6 +417,7 @@ effectiveStdenv.mkDerivation {
     (cmakeBool "OPENCV_GENERATE_PKGCONFIG" true)
     (cmakeBool "WITH_OPENMP" true)
     (cmakeBool "BUILD_PROTOBUF" false)
+    (cmakeFeature "CMAKE_CXX_STANDARD" "17") # required to enable protobuf
     (cmakeBool "PROTOBUF_UPDATE_FILES" true)
     (cmakeBool "OPENCV_ENABLE_NONFREE" enableUnfree)
     (cmakeBool "BUILD_TESTS" runAccuracyTests)