anchor.diff:          + head (splitString "." version)
           + ".x/${version}/mesa-${version}.tar.xz")
       ];
  -    multihash = "QmawFrgbj1Dvp1R8SWVJu3LsNMsStzrL7KM194RbtWiPzk";
  +    multihash = "QmW9sPT8zJvUqJrRaNFLE6Z5CNexUbKfvR82ovbkudppEj";
       hashOutput = false;  # Provided by upstream directly
  -    sha256 = "d3312a2ede5aac14a47476b208b8e3a401367838330197c4588ab8ad420d7781";
  +    sha256 = "69dbe6f1a6660386f5beb85d4fcf003ee23023ed7b9a603de84e9a37e8d98dea";
     };
   
     nativeBuildInputs = [
  
positive.code:     optionalString
      splitString;
  
    version = "18.1.1";
  
    # This is the default search path for DRI drivers
    driverSearchPath = "/run/opengl-driver-${stdenv.targetSystem}";
  
negative.code:         "8703 B670 0E7E E06D 7A39  B8D6 EDAE 37B0 2CEB 490D"
          "946D 09B5 E4C9 845E 6307  5FF1 D961 C596 A720 3456"
          "E3E8 F480 C52A DD73 B278  EE78 E1EC BE07 D7D7 0895"
          "71C4 B756 20BC 7570 8B4B  DB25 4C95 FAAB 3EB0 73EC"
        ];
        inherit (src) urls outputHash outputHashAlgo;
      };
  