Compile notes for Ubuntu and derivative OS's (eg Mint). 

Basic c libraries are required, and also the package xprintidle. 

Run the following (or open a command shell "sudo bash" and do likewise):

sudo apt-get install build-essential 
sudo apt-get install xprintidle

The program is now ready to compile:

gcc -Os slowNice3.c

mv a.out sn3.run