When build libva, it will fail to build mpeg2vldeom
Following is the make log:

make[3]: Entering directory `/home/lanhai/driver/libva/test/decode'
make[3]: *** No rule to make target `mpeg2vldemo.c', needed by `mpeg2vldemo.o'.  Stop.
make[3]: Leaving directory `/home/lanhai/driver/libva/test/decode'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/lanhai/driver/libva/test'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/lanhai/driver/libva'
make: *** [all] Error 2

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Reproduce steps:
./augoten.sh
./configure --enable-i965-driver --prefix=/opt/X11R7
make