anchor.diff:            inherit pname version;
             sha256 = "1l3kg062m02mph6rf9rdv8r5c5n356clxa6b6mrn0i77vk9g9kq0";
           };
  -      }));
  -  aiohttp = (stdenv.lib.overrideDerivation pythonPackages.aiohttp
  +      });
  +  aiohttp = pythonPackages.aiohttp.overrideAttrs
       (oldAttrs:
         rec {
           pname = "aiohttp";
  
positive.code:           ++ stdenv.lib.optional
                 (pythonPackages.pythonOlder "3.5")
                 pythonPackages.typing;
        }));
  in pythonPackages.buildPythonPackage rec {
    name = "${pname}-${version}";
    pname = "gns3-server";
  
negative.code:         };
          propagatedBuildInputs = [ async-timeout ]
            ++ (with pythonPackages; [ attrs chardet multidict yarl idna-ssl ]);
        });
    aiohttp-cors = pythonPackages.aiohttp-cors.overrideAttrs
      (oldAttrs:
        rec {
          pname = "aiohttp-cors";
  