anchor.diff:          boehmgc
         ];
     };
  -in releaseTools.nixBuild rec {
  +in stdenv.mkDerivation rec {
     pname = "hydra";
  -  version = "2019-05-06";
  +  version = "2019-08-30";
   
     inherit stdenv;
   
     src = fetchFromGitHub {
       owner = "NixOS";
       repo = pname;
  -    rev = "ff64583d07f046e378a6be596ec0ce7a9e2b7472";
  -    sha256 = "0w88q0saz7si22z3ryim6vdrv9qkwn6l25xfmiapvh5qrnrrdcb9";
  +    rev = "242b8b7a314759ed33f69205d26a1b7c337511e0";
  +    sha256 = "167ijcf9qdm10kjvqax3hcvs5mpa4mx2y2i9idwwc6xfvn8fhs84";
     };
   
     buildInputs =
  
positive.code:     ] ++ lib.optionals stdenv.isLinux [ rpm dpkg cdrkit ] );
  
    nativeBuildInputs = [ autoreconfHook pkgconfig ];
  
    patches = [
      (fetchpatch {
        url = "https://github.com/NixOS/hydra/pull/648/commits/4171ab4c4fd576c516dc03ba64d1c7945f769af0.patch";
        sha256 = "1fxa2459kdws6qc419dv4084c1ssmys7kqg4ic7n643kybamsgrx";
      })
    ];
  
    configureFlags = [ "--with-docbook-xsl=${docbook_xsl}/xml/xsl/docbook" ];
  
  
negative.code: { stdenv, nix, perlPackages, buildEnv, 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, boost, autoreconfHook
  }:
  
  with stdenv;
  