anchor.diff:        else
           false;
       thumbnails =
  -      if pythonPackages.pyxdg != null then
  +      if pyxdg != null then
           true
         else
           false;
       web =
  -      if pythonPackages.flask != null then
  +      if flask != null then
           true
         else
           false;
  
positive.code: 
  buildPythonPackage rec {
    name = "beets-${version}";
    version = "1.3.17";
    namePrefix = "";
  
    src = fetchFromGitHub {
      owner = "sampsyo";
      repo = "beets";
      rev = "v${version}";
      sha256 = "8b8c74478277e6b010cc1319c1e9b6fe97e1a8967bede341ebeabc205b7cc0f3";
    };
  
    nativeBuildInputs = [
  
negative.code:     "edit"
      "embedart"
      "embyupdate"
      "export"
      "filefilter"
      "freedesktop"
      "fromfilename"
      "ftintitle"
      "fuzzy"
      "hook"
      "ihate"
      "importadded"
      "importfeeds"
  