Thank you for the replies! Here is a screen shot of my Build Methods. As you can see, there are no folders listed under LIB directories. The folders that you are showing are under C:\Upp\Clang, these do not seem to be the implementation libraries for Ultimate++. For example, why are the SDL libraries stored under C:\Upp? Are these not generic SDL implementation libraries? It seems to me that Ultimate++ does not provide a way to create the Ultimate++ libraries....?? Or, do I need to run umk on each package, individually, to create these libraries?