Dependency Files while Compilation ?

[Ved Antani]

Hi,
I am developing/modifying an app in JSP/Servlet. The client has given source code that needs to be modified. This souce code uses some interfaces. The class files for these interfaces are not supplied to me. While compiling the servlets, the compiler gives error for missing classes.
The client has given me a bunch of "dependency files" instead of the actual classes...how do I use these files while compiling new servlets ?
Bye
Ved