Hello, I seem to have recovered from my Ubuntu problems by installing the ghc binary from http://www.haskell.org. However, if I modify a .cabal file, e.g. unix.cabal, then "runhaskell Setup.hs build" is always in the "re-configure" state even if I do a "runhaskell Setup.hs configure" ... It seems the re-configure state is determined by: -- |Check that localBuildInfoFile is up-to-date with respect to the -- .cabal file. checkPersistBuildConfig :: FilePath -> IO () checkPersistBuildConfig pkg_descr_file = do t0 <- getModificationTime pkg_descr_file t1 <- getModificationTime localBuildInfoFile when (t0 > t1) $ die (pkg_descr_file ++ " has been changed, please re-configure.") in /ghc-6.8.2/libraries/Cabal/Distribution/Simple. ?? Kind regards, Vasili