The answer is no. Building an executable builds machine code compiled for that particular environment. So if you build on a PC, you have to run on a PC.
LabVIEW source code itself (the block diagram) is cross-platform compatible for the most part, but the compiled code is not. When you transfer a VI from a development environment of LabVIEW on a PC to a development environment of LabVIEW on a Mac, the Mac LV will recompile the code automatically. Building an executable, however, removes the block diagram. And even if you have LV 8.0 and did a debug build that left the block diagram intact, the LV Run-Time engine has no ability to compile code.
Hope this is clear enough. The end result is that you need a copy of LV on the mac so you can build your executable there.
Jarrod S.
National Instruments