anchor.diff:  
   
     alembic = buildPythonPackage rec {
  -    name = "alembic-0.6.0";
  +    name = "alembic-0.6.6";
   
       src = fetchurl {
         url = "https://pypi.python.org/packages/source/a/alembic/${name}.tar.gz";
  -      md5 = "084fe81b48ebae43b0f6031af68a03d6";
  -    };
  -
  -    buildInputs = [ nose ];
  -    propagatedBuildInputs = [ Mako sqlalchemy ];
  +      md5 = "71e4a8f6849e1527abfc4ea33d51f37c";
  +    };
  +
  +    buildInputs = [ nose mock ];
  +    propagatedBuildInputs = [ Mako sqlalchemy9 ];
   
       meta = {
         homepage = http://bitbucket.org/zzzeek/alembic;
  
positive.code:   });
  
    fs = buildPythonPackage rec {
      name = "fs-0.4.0";
  
      src = fetchurl {
        url    = "https://pyfilesystem.googlecode.com/files/fs-0.4.0.tar.gz";
        sha256 = "1fk7ilwd01qgj4anw9k1vjp0amxswzzxbp6bk4nncp7210cxp3vz";
      };
  
      meta = with stdenv.lib; {
  
negative.code: 
  
    munkres = buildPythonPackage rec {
      name = "munkres-1.0.6";
  
      src = fetchurl {
        url = "http://pypi.python.org/packages/source/m/munkres/${name}.tar.gz";
        md5 = "d7ba3b8c5001578ae229a2d5a655872f";
      };
  
      # error: invalid command 'test'
  