anchor.diff:    };
   
     gevent = buildPythonPackage rec {
  -    name = "gevent-1.0.2";
  -    disabled = isPy3k || isPyPy;  # see https://github.com/surfly/gevent/issues/248
  +    name = "gevent-1.1rc3";
   
       src = pkgs.fetchurl {
         url = "https://pypi.python.org/packages/source/g/gevent/${name}.tar.gz";
  -      sha256 = "0cds7yvwdlqmd590i59vzxaviwxk4js6dkhnmdxb3p1xac7wmq9s";
  -    };
  -
  -    patchPhase = ''
  -      substituteInPlace libev/ev.c --replace \
  -        "ecb_inline void ecb_unreachable (void) ecb_noreturn" \
  -        "ecb_inline ecb_noreturn void ecb_unreachable (void)"
  -    '';
  -
  -    buildInputs = with self; [ pkgs.libev ];
  +      sha256 = "17g187dhr769s1rm99f2i5cjrhvmh0h3shkjdcdjciyi9ggzz56b";
  +    };
  +
  +    prePatch = ''
  +      rm -rf libev
  +    '';
  +
  +    buildInputs = [
  +      pkgs.libev
  +    ];
       propagatedBuildInputs = optionals (!isPyPy) [ self.greenlet ];
  +
  +    doCheck = false;
   
       meta = {
         description = "Coroutine-based networking library";
  
positive.code:       description = "A module provides basic functions for parsing mime-type names and matching them against a list of media-ranges";
        homepage = https://code.google.com/p/mimeparse/;
        license = licenses.mit;
      };
    };
  
  
negative.code: 
    colorama = buildPythonPackage rec {
      name = "colorama-${version}";
      version = "0.3.6";
  
      src = pkgs.fetchurl {
        url = "https://pypi.python.org/packages/source/c/colorama/${name}.tar.gz";
        sha256 = "1daknkr1iwxh32xc323614zjz39mwr7gk133hwkxg8c6n36gr7pc";
      };
  
      meta = {
  