虚拟机下直接编译Qt-4.4.3为嵌入式开发用的库，最近在编译qwt-6.1，但是编译过程出现如下错误：
/work/rootfs/work/qwt-6.1/examples/../lib/libqwt.so: undefined reference to `typeinfo for QLayout'
/work/rootfs/work/qwt-6.1/examples/../lib/libqwt.so: undefined reference to `typeinfo for QFutureInterfaceBase'
/work/rootfs/work/qwt-6.1/examples/../lib/libqwt.so: undefined reference to `typeinfo for QObject'
/work/rootfs/work/qwt-6.1/examples/../lib/libqwt.so: undefined reference to `typeinfo for QFrame'
/work/rootfs/work/qwt-6.1/examples/../lib/libqwt.so: undefined reference to `typeinfo for QPaintDevice'
/work/rootfs/work/qwt-6.1/examples/../lib/libqwt.so: undefined reference to `typeinfo for QWidget'
/work/rootfs/work/qwt-6.1/examples/../lib/libqwt.so: undefined reference to `typeinfo for QPaintEngine'
/work/rootfs/work/qwt-6.1/examples/../lib/libqwt.so: undefined reference to `typeinfo for QPushButton'
/work/rootfs/work/qwt-6.1/examples/../lib/libqwt.so: undefined reference to `typeinfo for QTextDocument'
/work/rootfs/work/qwt-6.1/examples/../lib/libqwt.so: undefined reference to `typeinfo for QThread'
/work/rootfs/work/qwt-6.1/examples/../lib/libqwt.so: undefined reference to `typeinfo for QScrollArea'
/work/rootfs/work/qwt-6.1/examples/../lib/libqwt.so: undefined reference to `typeinfo for QLayoutItem'
collect2: ld returned 1 exit status
make[2]: *** [../bin/animation] Error 1
make[2]: Leaving directory `/work/rootfs/work/qwt-6.1/examples/animation'
make[1]: *** [sub-animation-make_default] Error 2
make[1]: Leaving directory `/work/rootfs/work/qwt-6.1/examples'
make: *** [sub-examples-make_default-ordered] Error 2
特来求助，希望得到解答，谢谢！
P.S.makefile中也添加了-fno-rtti，但是没有效果。
