anchor.diff:  , gst_all_1
   , lib
   , python3Packages
  +, sphinxHook
   , runtimeShell
   , writeScript
   
  
positive.code:   # see: https://github.com/NixOS/nixpkgs/issues/56943#issuecomment-1131643663
    nativeBuildInputs = [
      gobject-introspection
    ];
  
    buildInputs = [
  
negative.code:     gst-plugins-good
      gst-plugins-ugly
    ]);
  
    outputs = [ "out" "doc" "man" ];
    sphinxBuilders = [ "html" "man" ];
  
    postInstall = ''
      mkdir -p $out/share/zsh/site-functions
  