Forwarding to Haskell-Cafe: I'm trying GHC as a library, as documented in: http://www.haskell.org/haskellwiki/GHC/As_a_library http://www.haskell.org/ghc/docs/7.2.1/html/users_guide/ghc-as-a-library.html However, this code: import GHC import GHC.Paths ( libdir ) import DynFlags ( defaultDynFlags ) main = defaultErrorHandler defaultDynFlags $ do runGhc (Just libdir) $ do dflags <- getSessionDynFlags setSessionDynFlags dflags target <- guessTarget "test_main.hs" Nothing setTargets [target] load LoadAllTargets Produces: Couldn't match expected type `Severity' with actual type `DynFlags.Settings' Expected type: DynFlags.LogAction Actual type: DynFlags.Settings -> DynFlags In the first argument of `defaultErrorHandler', namely `defaultDynFlags' In the expression: defaultErrorHandler defaultDynFlags How can I fix it? Note: this was on a fresh install with latest stable GHC installer 7.2.1.