It's the same thing as "Boyfriend-alert", but written in C.

You need to have WiringPi installed, it comes pre-installed on the new raspbian images. Once you have wiringPi installed you can compile the C program with gcc:

cc -o lights lights.c -Wall -Wextra -lwiringPi

This should create an executeable that you can run and makes the blinkeylights go blink.