ENH: Better way to add framework includes.

Modules/UseQt4.cmake

@@ -12,7 +12,7 @@ SET_PROPERTY(DIRECTORY APPEND PROPERTY COMPILE_DEFINITIONS_MINSIZEREL QT_NO_DEBU
 
 INCLUDE_DIRECTORIES(${QT_INCLUDE_DIR})
 IF(Q_WS_MAC AND QT_USE_FRAMEWORKS)
-  ADD_DEFINITIONS(-F${QT_LIBRARY_DIR})
+  INCLUDE_DIRECTORIES(${QT_QTCORE_LIBRARY})
 ENDIF(Q_WS_MAC AND QT_USE_FRAMEWORKS)
 
 SET(QT_LIBRARIES "")