Rebuild directFB demo

Rebuild directFB demo
(http://free-electrons.com/community/demos/qemu-arm-directfb/)
Host: Ubuntu 904, GCC by SourceryG++Lite 2008Q3

qemu-system-arm -M versatilepb -m 16 -kernel zImage

Note

1. As compiling kernel linux-2.6.20, get the error..
scripts/mod/sumversion.c:384: error: ‘PATH_MAX’ undeclared
Reference kernel linux-2.6.28, add following
#include <limits.h>

2. gawk: command not found
sudo apt-get install gawk