Let’s suppose that you were trying to port dtrace probes from (Open)Solaris to Mac OS X, and the makefile for the probes on (Open)Solaris calls for the -G option, which isn’t recognized by dtrace in 10.5. You might want to check out this mail thread to find out what to do.   

The driver for this is an effort to port OpenSolaris’ dtrace probes for Python to run on OS X. One benefit of this will be that we’ll have access to John Levon’s ustack provider for Python on the Mac. If someone wants to tackle a port for FreeBSD 7.1, it would be great to get this support into all dtrace enabled platforms.