anchor.diff:  { stdenv, fetchurl, gfortran }:
  -
  +let
  +  version = "3.5.0";
  +in
   stdenv.mkDerivation rec {
  -  name = "blas-3.5.0";
  +  name = "blas-${version}";
     src = fetchurl {
       url = "http://www.netlib.org/blas/${name}.tgz";
       sha256 = "096a3apnh899abjymjjg8m34hncagkzp9qxw08cms98g71fpfzgg";
  
positive.code:     (stdenv.lib.optionalString stdenv.isFreeBSD "mkdir -p $out/lib ;")
      + ''
      install ${dashD} -m755 libblas.a "$out/lib/libblas.a"
      install ${dashD} -m755 libblas.so.3.0.3 "$out/lib/libblas.so.3.0.3"
      ln -s libblas.so.3.0.3 "$out/lib/libblas.so.3"
      ln -s libblas.so.3.0.3 "$out/lib/libblas.so"
    '';
  
    meta = {
  
negative.code:     echo >>make.inc "ARCH = gfortran"
      echo >>make.inc "ARCHFLAGS = -shared -o"
      echo >>make.inc "RANLIB = echo"
      echo >>make.inc "BLASLIB = libblas.so.${version}"
    '';
  
    buildPhase = ''
  