On Tue, Apr 5, 2011 at 5:10 PM, Daniel Fischer <daniel.is.fischer@googlemail.com> wrote:

Short of changing the code, try installing encoding-0.6.3; that built with
ghc-6.12 on hackage, so it should work for you.

Thanks, Daniel, it does work. I summarize as bundle of

ghc-6.12
mtl-1.1(no mtl-2)
encoding-0.6.3

works

Gang