Programming of Arduino Uno

I am trying to run the Porcessing sketch for the Nunchuck foung on page 131 - 132.

It stop at #IInclude "Nunchuck.h"

How can I get past this? I heard you need a library. I wouldn't know anything about where to get it or if I have to built what to build it with. I tried saving a program called Nunchuck.h but it would only save it as: Nunchuck_h

I tried to use the Porcessing program and the Arduino program. Niether one would let me save it as Nunchuck.h

I also am not sure where to get hte right code for the Nunchuck
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