From d7806fe4ed8b82605367d77a02908705e9aac1a2 Mon Sep 17 00:00:00 2001
From: Averell Dalton <averell+nixpkgs@rxd4.com>
Date: Fri, 22 Feb 2019 19:46:58 +0100
Subject: [PATCH] openblas: adjust makeFlags handling

---
 pkgs/development/libraries/science/math/openblas/default.nix | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/science/math/openblas/default.nix b/pkgs/development/libraries/science/math/openblas/default.nix
index f4a97b7cf854..2ae3bd2b9c83 100644
--- a/pkgs/development/libraries/science/math/openblas/default.nix
+++ b/pkgs/development/libraries/science/math/openblas/default.nix
@@ -126,7 +126,8 @@ stdenv.mkDerivation rec {
     NO_STATIC = true;
     CROSS = stdenv.hostPlatform != stdenv.buildPlatform;
     HOSTCC = "cc";
-    NO_BINARY_MODE = stdenv.hostPlatform != stdenv.buildPlatform;
+    # Makefile.system only checks defined status
+    NO_BINARY_MODE = toString (stdenv.hostPlatform != stdenv.buildPlatform);
   });
 
   doCheck = true;