Defined QT_DIRECTFB_WINDOW_AS_CURSOR, Mouse cursor has black background.

Compiled qt-everywhere-opensource-src-4.6.3 successful, but,The mouse cursor was not displayed on the application GUI.
So, defined the option QT_DIRECTFB_WINDOW_AS_CURSOR, compiled QT again.
This time, the mouse cursor is in a black foursquare window. Mouse moving and click is OK.

configure:
./configure -opensource -release -shared -fast -no-largefile -qt-sql-sqlite -no-webkit \
-xplatform qws/linux-arm-g++ -embedded arm -little-endian -qt-freetype -depths 16,18 \
-qt-zlib -qt-gif -qt-libtiff -qt-libpng -qt-libmng -qt-libjpeg \
-make libs -nomake tools -nomake examples -nomake docs -nomake demo \
-no-gfx-linuxfb -no-gfx-transformed -no-gfx-multiscreen -no-gfx-vnc -no-gfx-qvfb \
-qt-gfx-directfb -no-glib -no-javascript-jit -no-script -no-scripttools \
-no-kbd-tty -no-kbd-qvfb -no-kbd-qnx \
-qt-kbd-linuxinput -qt-mouse-linuxinput

app:
./application -qws -display directfb