Thank you for your replies. Here is what I found. Be.h includes LocaleKit.h which includes NumberFormatImpl.h. I have commented out that last include, and my code now compiles. However, the debugger will not work with programs compiled from Paladin. When the debugger launches, either due to calls to debugger(), or by attaching a process, or from a null pointer access, I get a blank window. Even though Paladin is producing debugger code.