anchor.diff:  , perl
   
   , atk
  +, cairo
   , gdk-pixbuf
   , glib
  -, gnome3
   , gobject-introspection
   , gtk3
  +, hicolor_icon_theme
  +, libgee
   , pango
   , vala
   }:
  
positive.code: 
    buildInputs = [
      atk
      gdk-pixbuf
      glib
      gnome3.libgee
      gobject-introspection
      gtk3
      pango
      vala
    ];
  
    enableParallelBuilding = true;
  
    meta = with stdenv.lib; {
      description = "An extension to GTK+ used by elementary OS";
  
negative.code:     sha256 = "1inyq9qhayzg1kl7nc6i275k9yqdicl23rs5lyrz2xdsk8gxdhcf";
    };
  
    nativeBuildInputs = [
      cmake
      gettext
  