[Haskell-beginners] Installing Haskell on a Mac

[Torsten Otto]

Hi!

Two students in my class tried to install Haskell on their private  
MacBooks (one Leopard, one SnowLeopard). We used the package at http://hackage.haskell.org/platform/mac.html 
.  Neither of them got to install it as the button "Install" is greyed  
and not clickable.

What is the best way to install GHC on a current Mac? It would not  
necessarily have to be the latest greatest.

Regards,
Torsten