Unknown module(s) in QT: multimediagsttools-private

[lefei]

HI

       I run the example project of video. after i add android gstreamer path as "GSTREAMER_ROOT_ANDROID",
the  prj cant find "multimediagsttools-private".
      I dont konw what it is, please help me!  thankyou!!!

"QT += quick multimedia multimediawidgets
CONFIG += c++11

SOURCES += main.cpp

RESOURCES += qml.qrc

target.path = $$[QT_INSTALL_EXAMPLES]/multimedia/video/android/gstreamer
INSTALLS += target

GSTREAMER_ROOT_ANDROID = $$(GSTREAMER_ROOT_ANDROID)
isEmpty(GSTREAMER_ROOT_ANDROID): error("GSTREAMER_ROOT_ANDROID is empty")

INCLUDEPATH += $(GSTREAMER_ROOT_ANDROID)/armv7/include/ $(GSTREAMER_ROOT_ANDROID)/armv7/include/gstreamer-1.0 $(GSTREAMER_ROOT_ANDROID)/armv7/include/glib-2.0 $(GSTREAMER_ROOT_ANDROID)/armv7/lib/glib-2.0/include

QT+=multimediagsttools-private
LIBS += -L$(GSTREAMER_ROOT_ANDROID)/armv7/lib/ -L$(GSTREAMER_ROOT_ANDROID)/armv7/lib/gstreamer-1.0
-lgstcoreelements -lgstplayback -lgstvideotestsrc -lgstaudioconvert -lgstvideoconvert -lgstautodetect -lgsttypefindfunctions
#PLUGINS codecs
-lgstvorbis -lvorbis -lgstivorbisdec -lvorbisenc -lvorbisfile -lgstsubparse -lgstaudioparsers
-lgstgio -lgstapp -lgstisomp4 -lgstavi -lgstogg -lgstwavenc -lgstwavpack -lgstwavparse -lgsttheora -lgstmpg123 -lgstx264 -lgstlibav
-lgsttcp -lgstsoup -logg -ltheora -lmpg123 -lx264 -lavfilter -lavformat -lavcodec -lavutil -lbz2 -lswresample
-lsoup-2.4 -lgio-2.0 -lgstrtp-1.0 -lgstriff-1.0 -lgstnet-1.0
"