gdb and guile with lilypond

[Carl D. Sorensen]

Ok, so I've managed to build lilypond with debugging enabled, and I think I
built guile with debugging enabled (but I'm not positive, because I did it
with macports).

I've been able to set breakpoints in C++ routines and trace through things,
so I know gdb is working right on lilypond.

Is there any way to set breakpoints in scheme routines so that the debugger
will stop in the middle of a guile routine?

Thanks for your help,

Carl