I recently tried upgrading the package haskell98 to version 1.1.0.1.  Two things went wrong:

(1) Some of the time the build failed because it said it couldn't build time-1.2.0.4 (which I already had installed)

(2) Even when I finally managed to get it to build and install, compiling code led to this error message:

 Bad interface file: /usr/local/lib/haskell98-1.1.0.1/ghc-6.12.3/IO.hi

        Something is amiss; requested module  haskell98:IO differs from name found in the interface file haskell98-1.1.0.1:IO

I'm running GHC version 6.12.3.  Any help much appreciated.