Engine

I just finished my 3dGame Engine. It consists of many classes some of which one uses to control the engine. I was just wondering how i would go about turning the engine into a lib a dll or similar, just a file that any project can link and then use the engines classes as objects. At the moment i juust link all the header files. a lib or dll or better yet an external file that must be included in the game directory later would be preferable. Any ideas anybody. Help is much apreciated. Thanks in advance -CProgrammer