anchor.diff:  , perl
   
   , atk
  +, cairo
   , gdk-pixbuf
   , glib
  -, gnome3
   , gobject-introspection
   , gtk3
  +, hicolor_icon_theme
  +, libgee
   , pango
   , vala
   }:
  
positive.code:     sha256 = "1inyq9qhayzg1kl7nc6i275k9yqdicl23rs5lyrz2xdsk8gxdhcf";
    };
  
    cmakeFlags = [
      "-DINTROSPECTION_GIRDIR=share/gir-1.0/"
      "-DINTROSPECTION_TYPELIBDIR=lib/girepository-1.0"
    ];
  
    nativeBuildInputs = [
      cmake
      gettext
  
negative.code: 
    buildInputs = [
      atk
      cairo
      gdk-pixbuf
      glib
      libgee
      gobject-introspection
      gtk3
      hicolor_icon_theme
      pango
      vala
    ];
  
    cmakeFlags = [
      "-DINTROSPECTION_GIRDIR=\${out}/share/gir-1.0/"
      "-DINTROSPECTION_TYPELIBDIR=\${out}/lib/girepository-1.0"
    ];
  
    meta = with stdenv.lib; {
      description = "An extension to GTK+ used by elementary OS";
  