Trying to run ehci0.7 on ehci0.6

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i have installed ehci 0.6 on my linux ubuntu, 11.04.
I copied the source code of ehci.cpp and ehci.h and placed it in my code 
folder. I get the following errors.

/tmp/ccvmS1gO.o: In function `DrawHead(unsigned int)':
SceneDrawer.cpp:(.text+0x15d2): undefined reference to `g_ImageGenerator'
/tmp/ccLok2ua.o: In function `keyframeRelated()':
HeadTracker.cpp:(.text+0x73): undefined reference to `isEhciTextureCreated()'
HeadTracker.cpp:(.text+0x11a): undefined reference to `getEhciGlTexture()'
/tmp/ccLok2ua.o: In function `drawHeadModel(_IplImage*, float, XnVector3D)':
HeadTracker.cpp:(.text+0x47d): undefined reference to 
`setGeneratedImage(_IplImage*)'
HeadTracker.cpp:(.text+0x489): undefined reference to `getGeneratedImage()'
HeadTracker.cpp:(.text+0x4ab): undefined reference to `ehciLoop'
HeadTracker.cpp:(.text+0x4c8): undefined reference to `ehciLoop'
HeadTracker.cpp:(.text+0x4f8): undefined reference to `getGlPositMatrix'
collect2: ld returned 1 exit status

The command Im using to compile is 
g++ main.cpp  -I/usr/include/nite -I/usr/include/ni -I/usr/local/include 
-lOpenNI  -lGL -lGLU -lglut -lehci `pkg-config --libs --cflags opencv` 
`pkg-config --libs --cflags ehci` -lEGL SceneDrawer.cpp HeadTracker.cpp 
opengles.cpp -o abc

Do i need to place them in some specific folder? do I need to link any other 
library..
Please help me out!! I am new to Linux and Im struggling!!

Original issue reported on code.google.com by charand...@gmail.com on 12 Jul 2011 at 10:39