Strange issue on OSX

[Jeremy DeHaan via Digitalmars-d]

I wanted to try out OSX to make sure all my stuff was working 
fine there as well, but after downloading DMD and then running it 
in the terminal to make sure everything was good it gives me this 
error:
/usr/bin/dmd: Bad CPU type in executable


This is my first time using a Mac, so I could very well be doing 
something wrong. I didn't want to spend a lot of money, so it is 
a slightly older machine currently running OSX 10.6.8. It is an 
Intel Core Duo, which apparently won't let me upgrade to 
Mavericks, so I'm stuck with Snow Leopard.


Any advice for what I should do? Anyone seen this error before?

Thanks in advance,
     Jeremy