anchor.diff:        fitting.  There are over 1000 functions in total with an
         extensive test suite.
       '';
  -
  -    homepage = http://www.gnu.org/software/gsl/;
  -    license = "GPLv3+";
  -
  -    maintainers = [ ];
     };
   }
  
positive.code: { fetchurl, stdenv }:
  
  stdenv.mkDerivation rec {
    name = "gsl-1.15";
  
    src = fetchurl {
      url = "mirror://gnu/gsl/${name}.tar.gz";
      sha256 = "18qf6jzz1r3mzb5qynywv4xx3z9g61hgkbpkdrhbgqh2g7jhgfc5";
    };
  
    # ToDo: there might be more impurities than FMA support check
  
negative.code: 
    meta = {
      description = "The GNU Scientific Library, a large numerical library";
      homepage = http://www.gnu.org/software/gsl/;
      license = "GPLv3+";
  
      longDescription = ''
        The GNU Scientific Library (GSL) is a numerical library for C
  