a C Run Time library for Delphi, helps link with other C object files
Delphi come up a build in unit named System.Win.Crtl do the same job. How ever, this build in Unit didn't cover enough C functions.
I just copy paste this Unit, and Appends any functions I found when linking other C object files into it.
So, it is a better way to use this unit than the buildin one.