From 6f72708c126dbdad4edc0dec2d4e77bc20e743d3 Mon Sep 17 00:00:00 2001
From: Josef Kemetmueller <josef.kemetmueller@gmail.com>
Date: Thu, 20 Jul 2017 22:29:30 +0200
Subject: [PATCH] armadillo: Make use of openBLAS's built-in LAPACK

Even though the linked openBLAS contains LAPACK, the functionality was
not usable due to armadillo needing to link against it explicitly.
---
 pkgs/development/libraries/armadillo/default.nix | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/libraries/armadillo/default.nix b/pkgs/development/libraries/armadillo/default.nix
index d5a601f09ba..514c73f5e0f 100644
--- a/pkgs/development/libraries/armadillo/default.nix
+++ b/pkgs/development/libraries/armadillo/default.nix
@@ -12,9 +12,14 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ cmake ];
   buildInputs = [ openblasCompat superlu hdf5 ];
 
-  cmakeFlags = [ "-DDETECT_HDF5=ON" ];
+  cmakeFlags = let
+    libSuff = if stdenv.isDarwin then "dylib" else "so";
+  in [
+    "-DLAPACK_LIBRARY=${openblasCompat}/lib/libopenblas.${libSuff}"
+    "-DDETECT_HDF5=ON"
+  ];
 
- patches = [ ./use-unix-config-on-OS-X.patch ];
+  patches = [ ./use-unix-config-on-OS-X.patch ];
 
   meta = with stdenv.lib; {
     description = "C++ linear algebra library";