anchor.diff:  
   buildPythonPackage rec {
     pname = "thinc";
  -  version = "7.4.4";
  +  version = "7.4.5";
   
     src = fetchPypi {
       inherit pname version;
  -    sha256 = "08cf5cf7d70135db931c9f9d6f3b1844c53046c88f6072675fc164884f44c9e2";
  +    sha256 = "5743fde41706252ec6ce4737c68d3505f7e1cc3d4431174a17149838d594f8cb";
     };
   
  -  buildInputs = lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
  +  buildInputs = [ cython ] ++ lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
       Accelerate CoreFoundation CoreGraphics CoreVideo
     ]);
   
  
positive.code:    blis
     catalogue
     cymem
     cython
     murmurhash
     numpy
     plac
  
negative.code: 
    postPatch = ''
      substituteInPlace setup.py \
        --replace "blis>=0.4.0,<0.8.0" "blis>=0.4.0,<1.0" \
        --replace "catalogue>=0.0.7,<1.1.0" "catalogue>=0.0.7,<3.0" \
        --replace "plac>=0.9.6,<1.2.0" "plac>=0.9.6,<2.0" \
        --replace "srsly>=0.0.6,<1.1.0" "srsly>=0.0.6,<3.0"
  