anchor.diff:  
     requiredOctavePackages = requiredOctavePackages';
   
  -  nativeBuildInputs = [
  -    octave
  -    writeRequiredOctavePackagesHook
  -  ]
  -  ++ nativeBuildInputs;
  +  nativeBuildInputs = nativeBuildInputs';
   
     buildInputs = buildInputs ++ requiredOctavePackages';
   
  
positive.code: let
    requiredOctavePackages' = computeRequiredOctavePackages requiredOctavePackages;
  
  in stdenv.mkDerivation {
    packageName = "${fullLibName}";
    # The name of the octave package ends up being
    # "octave-version-package-version"
  
negative.code:   dontInstall = true;
  
    inherit meta;
  } // attrs')
  