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: { stdenv, nix, perlPackages, buildEnv, releaseTools, fetchFromGitHub
  , makeWrapper, autoconf, automake, libtool, unzip, pkgconfig, sqlite, libpqxx
  , gitAndTools, mercurial, darcs, subversion, bazaar, openssl, bzip2, libxslt
  , guile, perl, postgresql, nukeReferences, git, boehmgc, nlohmann_json
  , docbook_xsl, openssh, gnused, coreutils, findutils, gzip, lzma, gnutar
  , rpm, dpkg, cdrkit, pixz, lib, fetchpatch, boost, autoreconfHook
  }:
  