Install BCM 2835 C library on Raspbian

sudo ./configure
sudo make
sudo make install

http://www.airspayce.com/mikem/bcm2835/

bcm2835: C library for Broadcom BCM 2835 as used in Raspberry Pi
This is a C library for Raspberry Pi (RPi). It provides access to GPIO and other IO functions on the Broadcom BCM 2835 chip, allowing access to the GPIO pins on the 26 pin IDE plug on the RPi board so you can control and interface with various external devices. It provides functions for reading digital inputs and setting digital outputs, using SPI and I2C, and for accessing the system timers. P...
www.airspayce.com