anchor.diff:      description = "Basic Linear Algebra Subprograms";
       license = licenses.bsd3;
       homepage = "https://github.com/xianyi/OpenBLAS";
  -    platforms = with platforms; all;
  +    platforms = with platforms; unix;
       maintainers = with maintainers; [ ttuegel ];
     };
   }
  
positive.code:     ++
      [
        "FC=gfortran"
        "CC=${if stdenv.isDarwin then "clang" else "gcc"}"
        ''PREFIX="''$(out)"''
        "INTERFACE64=1"
  
negative.code: { stdenv, fetchurl, gfortran, perl, liblapack, config, coreutils }:
  
  with stdenv.lib;
  
  