[Interest] Q_WS_MAC sighting in Qt5.4

[glenn popelka]

I was browsing through qabstractitemview.cpp today and was surprised to 
find an instance of Q_WS_MAC in the code.

   pwd
   /c/Qt5.4/5.4/Src/qtbase/src/widgets/itemviews

   grep Q_WS *
   qabstractitemview.cpp:#ifdef Q_WS_MAC
   qabstractitemview.cpp:#ifdef Q_WS_MAC
   qabstractitemview.cpp:#ifndef Q_WS_MAC
   qheaderview.cpp:#if !defined(Q_WS_MAC)
   qtreeview.cpp:#if defined(Q_WS_MAC) && !defined(QT_NO_STYLE_MAC)

  Is this something to be worried about?

glenn