Hi,
I spoke to Duncan Coutts on IRC, he said that running gtk2hs with nhc98 was unlikely, but gtk2hs with YHC was likely.
I have had some initial discussion with Duncan, its documented at http://www.haskell.org/haskellwiki/Yhc/Gtk2Hs - its certainly a plan!
A look at http://www-users.cs.york.ac.uk/~ndm/yhc/report.html implies that the FFI doesn't work at all. Is that correct?
Yes, but thats only temporary - Tom wrote some initial FFI stuff at some point, its a bit of work but nothing insurmountable (I think). I don't know exactly what it will take to get FFI done (quite possibly just Tom's time, which is sadly in short supply)
Are there any other obstacles in the way of getting gtk2hs working with YHC?
Not that I know of, and in fact Gyhe (http://www.haskell.org/haskellwiki/Yhc/Yhe) is written using Gtk2Hs, so its pretty important that we get Gtk working or we won't be able to distribute a small cross platform evaluator. Thanks Neil