anchor.diff:  
     buildInputs = [
       gdk-pixbuf
  -    glade
       gtk3
       libxml2
  +  ] ++ lib.optionals enableGlade [
  +    glade
     ];
   
     checkInputs = [
  
positive.code:     updateScript = gnome3.updateScript {
        packageName = pname;
      };
    };
  
    meta = with lib; {
  
negative.code: 
    mesonFlags = [
      "-Dgtk_doc=true"
      "-Dglade_catalog=${if enableGlade then "enabled" else "disabled"}"
    ];
  
    # Uses define_variable in pkg-config, but we still need it to use the glade output
  