[Kevin Sevcik]

If you're having issues recompiling WPILib, you can do this more simply by grabbing copies of Counter.cpp and Counter.h and renaming the files and class from "Counter" to something like "AvgCounter". Then add them to your workspace and make a code change similar to the java one in the FirstForge link. In fact, I'd recommend doing it this way since it's a lot simpler than recompiling WPILib. It's what I did when I wanted a modified version of the PIDController and the PIDSubsystem classes.