anchor.diff:      optionalString
       splitString;
   
  -  version = "17.0.2";
  +  version = "17.0.3";
   
     # this is the default search path for DRI drivers
     driverSearchPath = "/run/opengl-driver-${stdenv.targetSystem}";
  
positive.code:         + head (splitString "." version)
          + ".x/${version}/mesa-${version}.tar.xz")
      ];
      multihash = "QmbgsKzPZ8ooifJMtkMH8DU1MyaLHYodxVwjbnbhtypiAR";
      hashOutput = false;  # Provided by upstream directly
      sha256 = "f8f191f909e01e65de38d5bdea5fb057f21649a3aed20948be02348e77a689d4";
    };
  
    nativeBuildInputs = [
  
negative.code:     srcVerification = fetchurl {
        failEarly = true;
        pgpsigUrls = map (n: "${n}.sig") src.urls;
        pgpKeyFingerprints = [
          "8703 B670 0E7E E06D 7A39  B8D6 EDAE 37B0 2CEB 490D"
          "946D 09B5 E4C9 845E 6307  5FF1 D961 C596 A720 3456"
        ];
        inherit (src) urls outputHash outputHashAlgo;
      };
    };
  