[Haskell-cafe] Listing package dependencies from GHC

If I'm doing development between ghci and vim, all the different dependencies I need get linked in when required without me asking. Similarly if I call "ghc --make" from the command line. But I have to write them in manually to my *.cabal file otherwise the compilation process will fail. Until now I've just loaded the program in to ghci and noted down all the dependencies it links in. Am I missing a trick? There must be an easier way, especially for multiple source files. cheers, D.