Mac OS X
HUGS on Mac OS X
There is a Fink package for Hugs.
GHC 6.4.1 on Mac OS X 10.3.9 (Panther) for PowerPC (PPC)
Haskell requires a newer version of XCode than the one distributed with Mac OS X 10.3 (Panther), this version of XCode only works on Mac OS X 10.4 and upwards. Currently there is no way to compile GHC on Mac OS X 10.3.9.
Then go get the GHC binary for OSX here http://www.haskell.org/ghc/dist/6.4.1/MacOSX/GHC-6.4.1.pkg.zip
Unpack the zip file & install the binary
GHC should be able to compile .hs files without any trouble.
Other notes:
This should also work for Tiger (OSX 10.4) and on Intel chips, but I dnt have any way to verify this.
The errors I recieved when trying to compile with only the distributed verison of XCode were like this: /tmp/ghc18985.s:232:Unknown pseudo-op: .subsections_via_symbols
Intel Macs
The GHC 6.6 binaries work just fine on Intel Macs. MacPorts also supports it now.