Hi, more progress: On top of base-pure, I created base-io involving GHC/IO and everything required to build it (which pulled in ST, some of Foreign and unfortunately some stuff related to Handles and Devices, because it is mentioned in IOException). This is the list of modules: Foreign.C.Types, Foreign.ForeignPtr, Foreign.ForeignPtr.Imp, Foreign.ForeignPtr.Safe, Foreign.ForeignPtr.Unsafe, Foreign.Ptr, Foreign.Storable, GHC.ForeignPtr, GHC.IO.BufferedIO, GHC.IO.Buffer, GHC.IO.Device, GHC.IO.Encoding.Types, GHC.IO.Exception, GHC.IO.Handle.Types, GHC.IO, GHC.IORef, GHC.MVar, GHC.Ptr, GHC.Stable, GHC.ST, GHC.Storable, GHC.STRef It is on a different branch on my github repo: https://github.com/nomeata/packages-base/tree/base-io GHC would complain that the CInt type is not valid in a ffi call (probably due to the different package name), so I replaced foreign declarations by regular ones defined using “undefined” – after all I’m just trying to discover how things can be split at all and just work towards building stuff. ST can probably be pulled below this package, after all it is quite pure. Either a package of its own, or in base-pure. Greetings, Joachim -- Joachim "nomeata" Breitner Debian Developer nomeata@debian.org | ICQ# 74513189 | GPG-Keyid: 4743206C JID: nomeata@joachim-breitner.de | http://people.debian.org/~nomeata