anchor.diff:    src = fetchPyPi {
       package = "rpyc";
       inherit version;
  -    sha256 = "65862f275894dd933bb64b81c250acd7e000ce9439a323c1f8b0de2259782ae5";
  +    sha256 = "a8991d0412a67d7299d105b4889b2b0b0d18e9b99404ea14eea56404fdb481c7";
     };
   
     propagatedBuildInputs = [
  
positive.code:   inherit (lib)
      optionals;
  
    version = "3.4.2";
  in
  buildPythonPackage rec {
    name = "rpyc-${version}";
  
negative.code:     nose
    ];
  
    doCheck = false;  # FIXME: re-enable for >3.4.4
  
    meta = with lib; {
      description = "A transparent and symmetric RPC library";
  