I didn't knew about :ctags of ghci. Some time ago I've tweaked cabal to start ghci with package options given in the .cabal file. Perhaps it might be useful for someone: module Main where import Distribution.Simple import Distribution.Simple.Configure import Distribution.Simple.LocalBuildInfo import System import System.Process import System.Exit import Monad main= do args <- getArgs -- check args to launch ghci when (length args > 0) $ do when ((args!!0) == "ghci") $ do lbi <- getPersistBuildConfig let packageArgs = (concat.concat) [ [" -package ", showPackageId pkg] | pkg <- packageDeps lbi ] system("ghci " ++ packageArgs) exitWith ExitSuccess defaultMain -- fallback to defaultMain Then you can use ./setup ghci to start ghci It is incomplete but should work for default packages.. Marc