Hi KennyA,
You really cannot use a Mac to do any development for a CompactRIO, not only is LabVIEW Real-Time and FPGA not compatible with a Mac but also the driver (NI-RIO) is not compatible either.
The only case in which you could use a Mac with a CompactRIO is by using the Mac as a user interface for the CompactRIO. By this I mean you could write a program to run on the Mac that would use either shared variables or TCP to communicate with the CompactRIO, the same way you would do for communicating between two computers.
Eli S.
National Instruments
Applications Engineer