[Haskell-beginners] Installing GHC and GHCi on a PowerPC Mac running MacOS 10.5.8

I am a complete newbie but fascinated by the Haskell language. I am trying to install GHC and GHCi on an older Mac and it seems like the recommended Haskell Platform is not supported on PowerPC running MacOS 10.5.8. Is this correct? I find that following the links on the site http://haskell.org/ghc/distribution_packages.html#macosx just sends me in circles so I am appealing to you for some hints as to how to proceed. I already have XCode 3.1 installed and I have just updated my MacPorts installation but now I confess I am a bit stuck. Can you recommend a reasonable path to follow from here? Thanx ::paul