On Wed, Jul 2, 2008 at 8:55 AM, Duncan <bugs@darcs.net> wrote:
> checking for module Control.Monad.Error... no; and neither in package mtl
> configure: error: Cannot find Control.Monad.Error; try installing package mtl?
>
> mtl is installed and of course it provides Control.Monad.Error. However I also
> have mtl-tf installed and it  provides Control.Monad.Error too. This trips up
> the configure test. (unregistering mtl-tf makes the test go through)

Can you provide the config.log and the output of configure (i.e.
stdout) for this error case? Thanks for the bug report!

David