Back to basics - Homemade five spice powder ?????

Chinese five spice is a classic flavouring in many Chinese cooking. I have bought and used many different brands of five spice powder. I noticed they all smell different and some didn't have much aroma at all.

Though it is called five spice, it is not a concrete rule to use only five type of spices. Five spice powder can contain 5 or more spices in any proportions. Common spices used can be