[Haskell-cafe] Cabal: error on configure

OK, I suspect this is a real newbie error, but please have mercy. I have downloaded and installed cabal (at least it responds to the --help command from the command line). Yet when I do, say (to give a real example): cabal configure parameterized_ data (having done he fetch) I get this error: cabal.exe: Using 'build-type" Custom' but there is no Setup.hs or Setup.lhs script.' When I download the package manually and look, there is a perfectly servicable Setup.hs script, which I call manually. So what gives? Dave Barton