Debugging on Mac OS X

Hi all, I just installed GHC 6.6 using the PPC binary installer on Mac OS X. I'm having some trouble getting debuggers to work; I have tried both plargleflarp (buddha) and Hat. Neither of them will compile on GHC 6.6 on Mac yet. For anyone in the same situation, how do you survive? I know of no other method of debugging Haskell programs, aside from manually running chunks of the code from within GHCi - but that makes it very difficult to debug nested 'where' functions. Thanks in advance Luke Worth