anchor.diff:  
   
     pyasn1 = buildPythonPackage ({
  -    name = "pyasn1-0.0.11a";
  -
  -    src = fetchurl {
  -      url = "mirror://sourceforge/pyasn1/pyasn1-devel/0.0.11a/pyasn1-0.0.11a.tar.gz";
  -      sha256 = "0b7q67ygdk48zn07pyhyg7r0b74gds50652ndpzfw4vs8l3vjg0b";
  +    name = "pyasn1-0.1.7";
  +
  +    src = fetchurl {
  +      url = "mirror://sourceforge/pyasn1/0.1.7/pyasn1-0.1.7.tar.gz";
  +      sha256 = "1aqy21fb564gmnkw2fbkn55c40diyx3z0ixh4savvxikqm9ivy74";
       };
   
       meta = {
  
positive.code:     };
    };
  
  
    mock = buildPythonPackage (rec {
      name = "mock-1.0.1";
  
negative.code:     };
    };
  
    netlib = buildPythonPackage rec {
      baseName = "netlib";
      name = "${baseName}-${meta.version}";
  
      src = fetchurl {
        url = "https://github.com/cortesi/netlib/archive/v${meta.version}.tar.gz";
        name = "${name}.tar.gz";
        sha256 = "1y8lx2j1jrr93mqfb06zg1x5jm9lllw744sb61ib8dagw43nnq3v";
      };
      
      buildInputs = [
        pkgs.pyopenssl pyasn1
      ];
  
      doCheck = false;
  
      meta = {
        version = "0.9";
        description = ''Man-in-the-middle proxy'';
        homepage = "https://github.com/cortesi/netlib";
        license = pkgs.lib.licenses.mit;
      };
    };
  
    nevow = buildPythonPackage (rec {
      name = "nevow-${version}";
  