[Haskell-cafe] "build depends:" in a .cabal file

Hello, It seems to me that the "build depends" attribute/field is only informational, i.e. it doesn't cause "faulting in" dependencies if not present? If true, this seems to be a deficiency in cabal. ?? Kind regards, Vasili PS It seems to me that for HaskellDB the "build depends" is incomplete in that it should contain "old time" and "TextPrettyPrint.HughesPJ"??