anchor.diff:          CatalystViewDownload
           CatalystViewJSON
           CatalystViewTT
  +        CatalystXScriptServerStarman
           CatalystXRoleApplicator
  -        CatalystXScriptServerStarman
           CryptRandPasswd
           DBDPg
           DBDSQLite
  
positive.code:   };
  in releaseTools.nixBuild rec {
    name = "hydra-${version}";
    version = "2018-08-07";
  
    inherit stdenv;
  
    src = fetchFromGitHub {
      owner = "NixOS";
      repo = "hydra";
      rev = "4dca8fe14d3f782bdf927f37efce722acefffff3";
      sha256 = "1yas4psmvfp7lhcp81ia2sy93b78j9hiw9a6n3q2m1a616hwpm25";
    };
  
    buildInputs =
  
negative.code:       guile # optional, for Guile + Guix support
        perlDeps perl nix
        postgresql # for running the tests
        nlohmann_json
      ] ++ lib.optionals isGreaterNix20 [ boost ];
  
    hydraPath = lib.makeBinPath (
  