For instance, instead of: $ ./bindir/fhpd ./pkglibdir/hpd-c Attached to process 10938 (fhpd) b main Error: Unknown command: b (fhpd) break main breakpoint 0 (fhpd) go (fhpd) Breakpoint 0 main report something like: fhpd) go (fhpd) Breakpoint 0 main at <file>#<line> 0xdeadbeeef 23 the line (fhpd) giving more context.