anchor.diff:  { stdenv, fetchurl, python, buildPythonPackage
  -, cython, bzip2, lzo, numpy, numexpr, hdf5, six }:
  +, cython, bzip2, lzo, numpy, numexpr, hdf5, six, c-blosc }:
   
   buildPythonPackage rec {
     version = "3.3.0";
  
positive.code:     [ "--hdf5=${hdf5}"
        "--lzo=${lzo}"
        "--bzip2=${bzip2.dev}"
      ];
  
    # Run the test suite.
  
negative.code:     sha256 = "0b4211s0zzdmh74k49ss0m9lc2ql2iazq2aa95ams6h45vqcr0w3";
    };
  
    buildInputs = [ hdf5 cython bzip2 lzo c-blosc ];
    propagatedBuildInputs = [ numpy numexpr six ];
  
    # The setup script complains about missing run-paths, but they are
  