433Kit is a collection of code and documentation designed to assist you in the connection and usage of RF 433MHz transmit and receive modules to/with your Arduino and Rapberry Pi.
On Raspberry Pi, 433Utils requires wiringPi, but wiringPi is now deprecated.
"I will make a final release of wiringPi available soon – with the sources, but that’s that. No more public releases. I’ll still be maintaining it for my own uses and clients, but for everyone else, please look at for alternative GPIO library for on-going projects."
from http://wiringpi.com/news/
On Raspberry Pi, 433Utils requires wiringPi, but wiringPi is now deprecated.
An unofficial mirror remains here: https://github.com/WiringPi/WiringPi