qrupdate: build with openblas

Replaces ATLAS and LAPACK with OpenBLAS. Also builds both static and
shared libraries. (Octave upstream recommends the shared library.)

pkgs/development/libraries/qrupdate/default.nix

···
 { stdenv
 , fetchurl
 , gfortran
-, liblapack
+, openblas
 }:
 stdenv.mkDerivation {
   name = "qrupdate-1.1.2";
   src = fetchurl {
     url = mirror://sourceforge/qrupdate/qrupdate-1.1.2.tar.gz ;
-    sha256 = "024f601685phcm1pg8lhif3lpy5j9j0k6n0r46743g4fvh8wg8g2";  			
+    sha256 = "024f601685phcm1pg8lhif3lpy5j9j0k6n0r46743g4fvh8wg8g2";
   };
-  
-  configurePhase = ''
-    export PREFIX=$out
-    sed -i -e 's,^BLAS=.*,BLAS=-L${liblapack}/lib -L${liblapack.blas} -lcblas -lf77blas -latlas,' \
-      -e 's,^LAPACK=.*,LAPACK=-L${liblapack}/lib -llapack -lcblas -lf77blas -latlas,' \
-      Makeconf
-  '';
+
+  configurePhase =
+    ''
+      export PREFIX=$out
+      sed -i -e 's,^BLAS=.*,BLAS=-L${openblas}/lib -lopenblas,' \
+          -e 's,^LAPACK=.*,LAPACK=-L${openblas}/lib -lopenblas,' \
+          Makeconf
+    ''
+    + stdenv.lib.optionalString openblas.blas64
+    ''
+      sed -i Makeconf -e '/^FFLAGS=.*/ s/$/-fdefault-integer-8/'
+    '';
 
   doCheck = true;
 
   checkTarget = "test";
 
-  buildTarget = "lib";
+  buildFlags = [ "lib" "solib" ];
 
-  installTarget = "install-staticlib";
-  
-  buildInputs = [ gfortran liblapack ];
+  installTargets = "install";
+
+  buildInputs = [ gfortran openblas ];
 }