From fe85ba58061356aff60ac6d6d1f8adf4a20361b2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B8rn=20Forsman?= <bjorn.forsman@gmail.com>
Date: Tue, 1 Sep 2015 22:20:38 +0200
Subject: [PATCH] opencv3: unbreak build (set "-DWITH_IPP=OFF")

OpenCV tries to download IPP itself at build time. That doesn't work
well with nix.
---
 pkgs/development/libraries/opencv/3.x.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/development/libraries/opencv/3.x.nix b/pkgs/development/libraries/opencv/3.x.nix
index eae31df4796..eed77b9113a 100644
--- a/pkgs/development/libraries/opencv/3.x.nix
+++ b/pkgs/development/libraries/opencv/3.x.nix
@@ -18,6 +18,10 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ cmake pkgconfig ];
 
+  # TODO: Pre-download IPP so that OpenCV doesn't try to download it itself
+  # (which fails).
+  cmakeFlags = [ "-DWITH_IPP=OFF" ];
+
   enableParallelBuilding = true;
 
   meta = {