Intel compiler (both version 7 and 8) can not compile atk/atkmm/text.cc and
gtk/gtkmm/enums.cc because of the duplicate namespace definitions such as
`namespace Glib { class Glib::XXX; }`.

../../atk/atkmm/text.h(181): error: qualified name is not allowed in
namespace member declaration
  class Glib::Value<Atk::TextAttribute> : public
Glib::Value_Enum<Atk::TextAttribute>
        ^
 
../../atk/atkmm/text.h(181): error: class "Glib::<error>" is not an entity
that can be explicitly specialized
  class Glib::Value<Atk::TextAttribute> : public
Glib::Value_Enum<Atk::TextAttribute>
  ^
 
text.cc(33): error: incomplete type is not allowed
  GType Glib::Value<Atk::TextAttribute>::value_type()
        ^

../../gtk/gtkmm/enums.h(1321): error: qualified name is not allowed in
namespace member declaration
  class Glib::Value<Gtk::IconSize> : public Glib::Value_Enum<Gtk::IconSize>
        ^
 
../../gtk/gtkmm/enums.h(1321): error: class "Glib::<error>" is not an
entity that can be explicitly specialized
  class Glib::Value<Gtk::IconSize> : public Glib::Value_Enum<Gtk::IconSize>
  ^
 
enums.cc(32): error: incomplete type is not allowed
  GType Glib::Value<Gtk::IconSize>::value_type()
        ^