1.) I know I can use Build-Depends: lib == <version>, lib2 < version, lib3 >= version and so on. Do you think it would be useful to introducue some notation to indicate a "tested with" ? Reason, purpose: I think its sometimes the case that a author/ mantainer is quite busy with other projects and misses that some dependencies break things.. If you want to try out you're left with some compiler errors and a dependency and have to try out which version works. I would propose using this syntax: lib-1.3 >=1.1 to indicate that lib 1.1 is required at leeast and tested with up to 1.3.. Cabal might then give a warning if you try to use 1.4 or greater "using newer version than tested" or similar.. What do you think? Would this be useful? 2.) Is there a ghci target? I find it quite useful using ghci to debug test/ check types functions of single modules... My hack is using a Setup.hs file like this adding ./setup ghci which runs ghci and adds all dependency as -pakcage arguments: module Main where import Distribution.Simple import Distribution.Simple.Configure 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 Would this be useful for you, too? Marc W.