Unix Makefiles

Have you ever wondered how people manage to write such complicated make files when you struggle to write a simple one? There are several lengthy tutorials on make files available on the internet. But once in a while, I feel there must be a simple ppt or a pdf that has just the basic tutorials for me to refresh my memory if I have forgotten something. Here is the link for the ppt which is simple and easy to understand and may come as handy when you need it.
https://docs.google.com/file/d/0B68pjOEpFpGVZHRZWE5sVk1zN0k/edit?usp=sharing