package authors, I'm preparing to release a new version of Cabal. This is the one that will come with ghc-6.12. A few packages with custom Setup.hs scripts will require some changes to compile with Cabal version 1.8. In most cases it is possible to have them continue to work with version 1.6 too. When you test your changes, please test against the darcs version of Cabal-1.8 rather than the one included in 6.12 RC2. The reason is that I've added in a couple API backwards compat fixes, so there's actually less to fix than you would find with the RC2 (and for at least one of those if you fix it to work with the Cabal pre-release version included in 6.12 RC2 it'll be impossible to make it work with Cabal-1.6 too). darcs get --partial http://darcs.haskell.org/cabal-branches/cabal-1.8 These minor changes will of course be rolled into the final version that comes with ghc 6.12.1. * HDBC-postgresql, MissingPy, Omega, HDBC-mysql These use the function requireProgram in their Setup.hs. This function drops one parameter in Cabal-1.8. To make the Setup.hs continue to work with Cabal-1.6 too, I suggest changing code like this: (pgconfigProg, _) <- requireProgram verbosity pgconfigProgram AnyVersion (withPrograms lbi) let pgconfig = rawSystemProgramStdout verbosity pgconfigProg into just: let pgconfig = rawSystemProgramStdoutConf verbosity pgconfigProgram (withPrograms lbi) * haskeline This uses GHC.build in its Setup.hs which no longer exists. It got split into GHC.buildLib and buildExe. Duncan