From 982aabc5617f144626a108fa6dc57bdcb9592e87 Mon Sep 17 00:00:00 2001
From: Thomas Tuegel <ttuegel@gmail.com>
Date: Wed, 3 Jun 2015 17:31:34 -0500
Subject: [PATCH] suitesparse_4_2: build with openblas

Compared to ATLAS, OpenBLAS offers better performance, faster builds,
and dynamic architecture detection.
---
 .../science/math/suitesparse/4.2.nix          | 34 +++++++++++++++----
 .../math/suitesparse/disable-metis.patch      | 18 ----------
 2 files changed, 28 insertions(+), 24 deletions(-)
 delete mode 100644 pkgs/development/libraries/science/math/suitesparse/disable-metis.patch

diff --git a/pkgs/development/libraries/science/math/suitesparse/4.2.nix b/pkgs/development/libraries/science/math/suitesparse/4.2.nix
index 4d27701b135a..16174a80212f 100644
--- a/pkgs/development/libraries/science/math/suitesparse/4.2.nix
+++ b/pkgs/development/libraries/science/math/suitesparse/4.2.nix
@@ -1,22 +1,44 @@
-{ stdenv, fetchurl, blas, liblapack, gfortran } :
+{ stdenv, fetchurl, gfortran, openblas }:
+
+let
+  int_t = if openblas.blas64 then "int64_t" else "int32_t";
+in
 stdenv.mkDerivation rec {
   version = "4.2.1";
   name = "suitesparse-${version}";
   src = fetchurl {
     url = "http://www.cise.ufl.edu/research/sparse/SuiteSparse/SuiteSparse-${version}.tar.gz" ;
-    sha256 = "1ga69637x7kdkiy3w3lq9dvva7220bdangv2lch2wx1hpi83h0p8";  			
+    sha256 = "1ga69637x7kdkiy3w3lq9dvva7220bdangv2lch2wx1hpi83h0p8";
   };
-  buildInputs = [blas liblapack gfortran] ;
-  patches = [./disable-metis.patch];
+
+  nativeBuildInputs = [ gfortran ];
+  buildInputs = [ openblas ];
 
   preConfigure = ''
-    export PREFIX=$out
     mkdir -p $out/lib
     mkdir -p $out/include
+
+    sed -i "SuiteSparse_config/SuiteSparse_config.mk" \
+        -e 's/METIS .*$/METIS =/' \
+        -e 's/METIS_PATH .*$/METIS_PATH =/' \
+        -e '/CHOLMOD_CONFIG/ s/$/-DNPARTITION -DLONGBLAS=${int_t}/' \
+        -e '/UMFPACK_CONFIG/ s/$/-DLONGBLAS=${int_t}/'
   '';
 
-  makeFlags = ''PREFIX=\"$(out)\" INSTALL_LIB=$(out)/lib INSTALL_INCLUDE=$(out)/include'';
+  makeFlags = [
+    "PREFIX=\"$(out)\""
+    "INSTALL_LIB=$(out)/lib"
+    "INSTALL_INCLUDE=$(out)/include"
+    "BLAS=-lopenblas"
+    "LAPACK="
+  ];
 
   NIX_CFLAGS = "-fPIC";
 
+  meta = with stdenv.lib; {
+    homepage = http://faculty.cse.tamu.edu/davis/suitesparse.html;
+    description = "A suite of sparse matrix algorithms";
+    license = with licenses; [ bsd2 gpl2Plus lgpl21Plus ];
+    maintainers = with maintainers; [ ttuegel ];
+  };
 }
diff --git a/pkgs/development/libraries/science/math/suitesparse/disable-metis.patch b/pkgs/development/libraries/science/math/suitesparse/disable-metis.patch
deleted file mode 100644
index 5b735eb7d3c9..000000000000
--- a/pkgs/development/libraries/science/math/suitesparse/disable-metis.patch
+++ /dev/null
@@ -1,18 +0,0 @@
-diff -Nrc SuiteSparse/UMFPACK/Demo/Makefile SuiteSparse-new/UMFPACK/Demo/Makefile
-*** SuiteSparse/UMFPACK/Demo/Makefile	2009-11-11 21:09:45.000000000 +0100
---- SuiteSparse-new/UMFPACK/Demo/Makefile	2010-08-02 12:53:16.000000000 +0200
-***************
-*** 40,46 ****
-  ../../CAMD/Lib/libcamd.a:
-  	( cd ../../CAMD ; $(MAKE) library )
-  
-- $(METIS):
-- 	( cd $(METIS_PATH) && $(MAKE) )
-  
-  UMFPACK = ../Lib/libumfpack.a ../../AMD/Lib/libamd.a \
---- 40,44 ----
-  ../../CAMD/Lib/libcamd.a:
-  	( cd ../../CAMD ; $(MAKE) library )
-  
-  
-  UMFPACK = ../Lib/libumfpack.a ../../AMD/Lib/libamd.a \