anchor.diff:          + head (splitString "." version)
           + ".x/${version}/mesa-${version}.tar.xz")
       ];
  -    multihash = "QmbgsKzPZ8ooifJMtkMH8DU1MyaLHYodxVwjbnbhtypiAR";
  +    multihash = "QmWraRsGyUzqyMutCtreec86bMsYpSVoL9RcmFeNQ1zhxV";
       hashOutput = false;  # Provided by upstream directly
  -    sha256 = "f8f191f909e01e65de38d5bdea5fb057f21649a3aed20948be02348e77a689d4";
  +    sha256 = "ca646f5075a002d60ef9123c8a4331cede155c01712ef945a65c59a5e69fe7ed";
     };
   
     nativeBuildInputs = [
  
positive.code:     optionalString
      splitString;
  
    version = "17.0.2";
  
    # this is the default search path for DRI drivers
    driverSearchPath = "/run/opengl-driver-${stdenv.targetSystem}";
  
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;
      };
    };
  