Wprogram.h - can't find it

Probably a basic question but it is stumping me

I am getting the following error:

error: WProgram.h: No such file or directory

I commented it out "#include <WProgram.h>" and replaced it with "#include <Arduino.h>" which was found. I did this since I suspected Arduino.h might have obsoleted WProgram.h, but I have no evidence for this.

Anyway, what do I need to do so that I can include WProgram.h properly?

Thanks,
memotick

Arduino.h is the 1.0 version of WProgram.h

Read http://arduino.cc/forum/index.php/topic,97455.0.html
See Point 2.