anchor.diff:        };
   
         nativeBuildInputs = [
  -        python2Packages.lxml
  -        python2Packages.python
  +        python3Packages.lxml
  +        python3Packages.python
         ];
   
         postPatch = ''
  
positive.code: , fetchurl
  , fetchFromGitHub
  , lib
  , python2Packages
  }:
  
  # TODO: build release tarballs, repo vendors pdfs
  
negative.code:   name = "opengl-headers-${version}";
  
    src = fetchurl {
      name = "opengl-headers-${version}.tar.xz";
      multihash = "QmZdRTzsSxGWTSzmChywUgo6drKFoho8qDh4FagumAM3eS";
      sha256 = "7cfa0ed4091b4d04c33b1be3c30361f9613b7301744f0b4b6397b923d82295d0";
    };
  