ghci Problem

I've built ghc and installed it but when I run ghci e.g. the up arrow keys don't work :-( Can someone let me know what I've done wrong and how to fix it? Thanks, Dominic.

dom@lagrange:~/ndp> ghci GHCi, version 6.9.20080517: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer ... linking ... done. Loading package base ... linking ... done. Prelude> ^[[A