With a file containing:

module Main where

import Array
import Control.Functor.Fix
I get:

make
ghc -i/root/.cabal/lib/category-extras-0.53.5/ghc-6.8.2 -c catamorphism.example.hs

catamorphism.example.hs:19:0:
    Bad interface file: /root/.cabal/lib/category-extras-0.53.5/ghc-6.8.2/Control/Functor/Fix.hi
        Something is amiss; requested module  main:Control.Functor.Fix differs from name found in the interface file category-extras-0.53.5:Control.Functor.Fix
make: *** [all] Error 1
I used cabal to install category-extras:

/home/evansl/download/haskell/libs # cabal install category-extras
Resolving dependencies...
Downloading category-extras-0.53.5...
Configuring category-extras-0.53.5...
Preprocessing library category-extras-0.53.5...
...
/usr/bin/ar: creating dist/build/libHScategory-extras-0.53.5.a
Installing library in /root/.cabal/lib/category-extras-0.53.5/ghc-6.8.2
Registering category-extras-0.53.5...
Reading package info from "dist/installed-pkg-config" ... done.
Saving old package config file... done.
Writing new package config file... done.
/home/evansl/download/haskell/libs #
What should I do to import the Functor.Fix as shown here:

http://comonad.com/reader/2008/recursion-schemes/

TIA.

-Larry