What is D's minimum requirements on Mac?

[Adam D. Ruppe via Digitalmars-d-learn]

I'm still tempted to grab a used Mac so I can port my display 
stuff to Cocoa and test it, but Macs are outrageously expensive 
and I hate them, so want to spend as little as possible.

What does dmd minimally require on a mac? If I got like a 10.5 
would that work?

i'm considering something like
http://www.amazon.com/Apple-MB138LL-Intel-Drive-Combo/dp/B0006HU49Y/ref=sr_1_5?ie=UTF8&qid=1433962021&sr=8-5&keywords=used+mac+mini