Hi, with the patch below, the head version[1] of bytestring compiles in the ghc tree (replacing libraries/bytestring) and passes validate. No code had to be changed, just the base dependency and a few OPTIONS_GHC pragmas because of orphan instances. enjoy, Bertram [1] http://darcs.haskell.org/bytestring/ not http://darcs.haskell.org/ghc-6.10/packages/bytestring/ or http://darcs.haskell.org/packages/bytestring/ P.S. why does it list libraries@h.o as the maintainer? But never mind, Don reads this list. Tue Sep 23 05:49:33 CEST 2008 Bertram Felgenhauer <int-e@gmx.de> * Fix build with ghc-6.10 Also fix build with -Werror.