anchor.diff:    '';
   
     buildPhase = ''
  +    cp -v ${autooptions}/autooptions.py autooptions.py
       cp -v ${autowaf} autowaf.py
       cp -v ${lv2} lv2.py
  -    ${python.interpreter} waf-light build --tools=$(pwd)/autowaf.py,$(pwd)/lv2.py
  +    ${python.interpreter} waf-light build --tools=$(pwd)/autooptions.py,$(pwd)/autowaf.py,$(pwd)/lv2.py
     '';
   
     installPhase = ''
  
positive.code: { stdenv
  , fetchurl
  , lib
  
  
negative.code: }:
  
  let
    autooptions = stdenv.mkDerivation rec {
      name = "waf-autooptions-2018-10-06";
  
      src = fetchFromGitLab {
        version = 6;
        owner = "karllinden";
        repo = "waf-autooptions";
        rev = "cc16822604501c96af265a2e3c51855d2aed635f";
        sha256 = "69702af83555ce127765752bb55acfa0412ff436d18569900349d60e10f3e569";
      };
  
      installPhase = ''
        mkdir -v $out
        cp -v __init__.py $out/autooptions.py
      '';
  
      meta = with lib; {
        license = licenses.bsd2;
      };
    };
  
    autowaf = fetchurl {
      # r101
      # This is not a persistent URL since it is the SVN repo, so we rely on
  