anchor.diff: -{ stdenv, buildPythonPackage, fetchPypi, blessings, mock, nose, pyte, wcwidth, typing }:
  +{ stdenv, buildPythonPackage, fetchPypi, fetchpatch, pythonOlder, blessings, mock, nose, pyte, wcwidth, typing }:
   
   buildPythonPackage rec {
     pname = "curtsies";
  
positive.code: 
    meta = with stdenv.lib; {
      description = "Curses-like terminal wrapper, with colored strings!";
      homepage = https://pypi.python.org/pypi/curtsies;
      license = licenses.mit;
      maintainers = with maintainers; [ flokli ];
    };
  
negative.code:     sha256 = "89c802ec051d01dec6fc983e9856a3706e4ea8265d2940b1f6d504a9e26ed3a9";
    };
  
    patches = [
      # Fix dependency on typing. Remove with the next release
      (fetchpatch {
        url = https://github.com/bpython/curtsies/commit/217b4f83e954837f8adc4c549c1f2f9f2bb272a7.patch;
        sha256 = "1d3zwx9c7i0drb4nvydalm9mr83jrvdm75ffgisri89h337hiffs";
      })
    ];
  
    propagatedBuildInputs = [ blessings wcwidth ]
      ++ stdenv.lib.optionals (pythonOlder "3.5") [ typing ];
  
    checkInputs = [ mock pyte nose ];
  
  