From 6919867b3b624e0792258089899b06b90b3aac85 Mon Sep 17 00:00:00 2001
From: Bas van Dijk <v.dijk.bas@gmail.com>
Date: Sun, 31 Dec 2017 14:39:33 +0100
Subject: [PATCH] opencv: disable dnn_modern on darwin

---
 pkgs/development/libraries/opencv/3.x.nix | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/opencv/3.x.nix b/pkgs/development/libraries/opencv/3.x.nix
index 9f8e97aa114..9b48c617696 100644
--- a/pkgs/development/libraries/opencv/3.x.nix
+++ b/pkgs/development/libraries/opencv/3.x.nix
@@ -232,7 +232,13 @@ stdenv.mkDerivation rec {
     "-DCUDA_FAST_MATH=ON"
     "-DCUDA_HOST_COMPILER=${cudatoolkit.cc}/bin/gcc"
   ]
-    ++ lib.optionals stdenv.isDarwin ["-DWITH_OPENCL=OFF" "-DWITH_LAPACK=OFF"];
+    ++ lib.optionals stdenv.isDarwin [
+      "-DWITH_OPENCL=OFF"
+      "-DWITH_LAPACK=OFF"
+
+      # On OS X the tiny-dnn-1.0.0a3 dependency of dnn_modern fails to build.
+      "-DBUILD_opencv_dnn_modern=OFF"
+    ];
 
   enableParallelBuilding = true;