anchor.diff:          outputHash
           outputHashAlgo
           urls;
  -      pgpsigUrls = map (n: "${n}.sig") src.urls;
  -      pgpKeyFingerprints = [
  -        # Daniel Stone
  -        "A66D 805F 7C93 29B4 C5D8  2767 CCC4 F07F AC64 1EFF"
  -      ];
  +      fullOpts = {
  +        pgpsigUrls = map (n: "${n}.sig") src.urls;
  +        pgpKeyFingerprints = [
  +          # Daniel Stone
  +          "A66D 805F 7C93 29B4 C5D8  2767 CCC4 F07F AC64 1EFF"
  +        ];
  +      };
         failEarly = true;
       };
     };
  
positive.code: }:
  
  stdenv.mkDerivation rec {
    name = "libxcb-1.13";
  
    src = fetchurl {
      url = "mirror://xorg/individual/xcb/${name}.tar.bz2";
      hashOutput = false;
      sha256 = "188c8752193c50ff2dbe89db4554c63df2e26a2e47b0fa415a70918b5b851daa";
    };
  
    nativeBuildInputs = [
  
negative.code:     "--enable-selective-werror"
      "--disable-strict-compilation"
      "--disable-devel-docs"
      "--enable-dri3"
      "--enable-xevie"
      "--enable-xprint"
      "--enable-selinux"
      "--without-doxygen"
      "--without-launchd"
    ];
  
    passthru = {
  