anchor.diff:  
     nativeBuildInputs = [
       intltool
  +    makeWrapper
     ];
   
     buildInputs = [
       glib
       gtk_2
  +    libx11
       libxfce4ui
       libxfce4util
       perlPackages.URI
  -    xorg.libX11
  -    xorg.xproto
  +    xproto
     ];
   
     configureFlags = [
  
positive.code: , fetchurl
  , intltool
  , lib
  
  , glib
  , gtk_2
  , libxfce4ui
  , libxfce4util
  , perlPackages
  , xorg
  }:
  
  let
  
negative.code:     "--with-x"
    ];
  
    preFixup = ''
      wrapProgram $out/bin/exo-desktop-item-edit \
        --set 'GTK2_RC_FILES' \
            '${gnome-themes-standard}/share/themes/Adwaita/gtk-2.0/gtkrc' \
        --prefix 'XDG_DATA_DIRS' : "${shared-mime-info}/share"
      wrapProgram $out/bin/exo-preferred-applications \
        --set 'GTK2_RC_FILES' \
            '${gnome-themes-standard}/share/themes/Adwaita/gtk-2.0/gtkrc' \
        --prefix 'XDG_DATA_DIRS' : "${shared-mime-info}/share"
    '';
  
    meta = with lib; {
      description = "Extensions to Xfce by os-cillation";
      homepage = http://www.xfce.org/;
  