OS X doesn't support the older DTRACE_PROBE style macros, only
the newer (and much safer!) typechecked generated header files.
The DTRACE_PROBE macros are still being exposed in sdt.h. I tried using them without running "dtrace -G", and the app built successfully except none of the probes were available. Is there any chance that this approach can be made to work, if not now, in the future?