anchor.diff:  
   buildPythonPackage rec {
     pname = "cliff";
  -  version = "3.10.1";
  +  version = "4.0.0";
   
     src = fetchPypi {
       inherit pname version;
  -    sha256 = "sha256-BFruPzxkRxll161QfOhHSk4vIIFfu1QFp3D4WWoqAKA=";
  +    sha256 = "sha256-Ow0w56z1DjwhSjnuPmaqLytZV+Kh3jc+F7uo6Yx1AaU=";
     };
   
     postPatch = ''
  
positive.code:   propagatedBuildInputs = [
      autopage
      cmd2
      pbr
      prettytable
      pyparsing
  
negative.code: , fetchPypi
  , autopage
  , cmd2
  , importlib-metadata
  , installShellFiles
  , openstackdocstheme
  , pbr
  