From bc158d37fedb307d3b6b6bbf47fd5507c5d2036d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Josef=20Kemetm=C3=BCller?= <josef.kemetmueller@gmail.com>
Date: Mon, 4 Jun 2018 16:25:16 +0200
Subject: [PATCH] eigen3_3: Fix darwin build

---
 pkgs/development/libraries/eigen/3.3.nix | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/eigen/3.3.nix b/pkgs/development/libraries/eigen/3.3.nix
index 5d13fb09dcca..7de05926da59 100644
--- a/pkgs/development/libraries/eigen/3.3.nix
+++ b/pkgs/development/libraries/eigen/3.3.nix
@@ -1,4 +1,4 @@
-{stdenv, fetchurl, cmake}:
+{stdenv, fetchurl, fetchpatch, cmake}:
 
 let
   version = "3.3.4";
@@ -11,6 +11,15 @@ stdenv.mkDerivation {
     name = "eigen-${version}.tar.gz";
     sha256 = "1q85bgd6hnsgn0kq73wa4jwh4qdwklfg73pgqrz4zmxvzbqyi1j2";
   };
+
+  patches = [
+    # Remove for > 3.3.4
+    # Upstream commit from 6 Apr 2018 "Fix cmake scripts with no fortran compiler"
+    (fetchpatch {
+      url    = "https://bitbucket.org/eigen/eigen/commits/ba14974d054ae9ae4ba88e5e58012fa6c2729c32/raw";
+      sha256 = "0fskiy9sbzvp693fcyv3pfq8kxxx3d3mgmaqvjbl5bpfjivij8l1";
+    })
+  ];
   
   nativeBuildInputs = [ cmake ];