anchor.diff:      gtk3
       libxml2
       openldap
  -    gnome2.ORBit2
  -    #orbit
  +    orbit2
       polkit
     ];
   
  
positive.code: , libxml2
  , polkit
  , openldap
  #, orbit
  }:
  
  with {
  
negative.code:     "--disable-gtk-doc-pdf"
      "--disable-documentation"
      "--enable-gtk"
      (enFlag "orbit" (orbit2 != null) null)
      (enFlag "defaults-service" (dbus_glib != null) null)
      "--enable-gsettings-backend"
      "--enable-nls"
  