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:         "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"
        ];
        inherit (src) urls outputHash outputHashAlgo;
      };
  
negative.code:     optionalString
      splitString;
  
    version = "18.1.5";
  
    # This is the default search path for DRI drivers
    driverSearchPath = "/run/opengl-driver-${stdenv.targetSystem}";
  