propeller c clock speed

I bought a propeller education kit some time ago. this was when spin was all there was. I had so many projects that years have passed and I never did master spin. I just bought a activity bot and am learning propeller c but I am unable to find how to set the propellers clock speed. if I remember right in spin you the default was 5mhz unless you specified a higher clock up to 80mhz.

there must be a way to do the same thing in c?

thanks