anchor.diff:  }:
   
   stdenv.mkDerivation rec {
  -  name = "xf86-video-amdgpu-18.0.0";
  +  name = "xf86-video-amdgpu-19.0.0";
   
     src = fetchurl {
       url = "mirror://xorg/individual/driver/${name}.tar.bz2";
       hashOutput = false;
  -    sha256 = "e909b9707d2562dfc36d8075a8cbddbc93901aaa8f2522d9a429c3fc5ad66d94";
  +    sha256 = "8836147d4755908ec9e192b7cc485fbc2ce7706de33f7bea515294d3ba4c4f51";
     };
   
     nativeBuildInputs = [
  
positive.code:         outputHash
          outputHashAlgo
          urls;
        pgpsigUrls = map (n: "${n}.sig") src.urls;
        pgpKeyFingerprints = [
          # Michel Daenzer
          "B09F AF35 BE91 4521 9809  5114 5A81 AF8E 6ADB B200"
        ];
        failEarly = true;
      };
    };
  
negative.code:   buildInputs = [
      xorg.glamoregl
      libdrm
      libpciaccess
      opengl-dummy
      systemd_lib
      xorg-server
  