diff --git a/Modules/FindQt4.cmake b/Modules/FindQt4.cmake
index e7d25c9..1cac917 100644
--- a/Modules/FindQt4.cmake
+++ b/Modules/FindQt4.cmake
@@ -65,6 +65,11 @@
 #       is much more flexible, but requires that FindQt4.cmake is executed before
 #       such an exported dependency file is processed.
 #
+#  QT_INCLUDE_AS_SYSTEM_HEADERS
+#        If this variable is set to TRUE, the Qt header files will be included as
+#        system headers if the compiler supports it, ignoring most warnings 
+#        occuring in them.
+#
 # There are also some files that need processing by some Qt tools such as moc
 # and uic.  Listed below are macros that may be used to process those files.
 #
diff --git a/Modules/UseQt4.cmake b/Modules/UseQt4.cmake
index e8166f4..53b5cf6 100644
--- a/Modules/UseQt4.cmake
+++ b/Modules/UseQt4.cmake
@@ -89,7 +89,11 @@ foreach(module QT3SUPPORT QTOPENGL QTASSISTANT QTDESIGNER QTMOTIF QTNSPLUGIN
       if(QT_USE_${module})
         string(REPLACE "QT" "" qt_module_def "${module}")
         add_definitions(-DQT_${qt_module_def}_LIB)
-        include_directories(${QT_${module}_INCLUDE_DIR})
+        if(QT_INCLUDE_AS_SYSTEM_HEADERS)
+          include_directories(SYSTEM ${QT_${module}_INCLUDE_DIR})
+        else()
+          include_directories(${QT_${module}_INCLUDE_DIR})
+        endif()
       endif()
       set(QT_LIBRARIES ${QT_LIBRARIES} ${QT_${module}_LIBRARY})
       set(QT_LIBRARIES_PLUGINS ${QT_LIBRARIES_PLUGINS} ${QT_${module}_PLUGINS})