anchor.diff:      };
     };
   
  +  zbase32 = buildPythonPackage (rec {
  +    name = "zbase32-1.1.1";
  +
  +    src = fetchurl {
  +      url = "http://pypi.python.org/packages/source/z/zbase32/${name}.tar.gz";
  +      sha256 = "0n59l4rs26vrhxpsfrwybjjir68aj23f09k1yjnbxqy5n0khp8gm";
  +    };
  +
  +    # Tests require `pyutil' so disable them to avoid circular references.
  +    doCheck = false;
  +
  +    buildInputs = [ setuptoolsDarcs ];
  +
  +    meta = {
  +      description = "zbase32, a base32 encoder/decoder";
  +
  +      homepage = http://pypi.python.org/pypi/zbase32;
  +
  +      license = "BSD";
  +    };
  +  });
  +
   }
  
positive.code:       name = "${name}.tar.gz";
      };
  
      propagatedBuildInputs = [ pkgs.twisted ];
  
      meta = {
        description = "Nevow, a web application construction kit for Python";
  
negative.code:       sha256 = "1wkqgm6anlxvz8dnqx7ki008255nm1mlhak5n9xy6g1yf31fn3l0";
      };
  
      propagatedBuildInputs = [ twisted pkgs.pyopenssl ];
  
      meta = {
        homepage = http://foolscap.lothar.com/;
  