[[!comment format=mdwn
 username="http://joeyh.name/"
 ip="4.154.6.49"
 subject="comment 3"
 date="2012-11-25T18:56:01Z"
 content="""
On my Debian system, where it builds ok, I have the same ghc version, but version 2.1.1 of mtl. I suspect your old version of that is the problem. You can try using cabal to install a newer mtl:

<pre>
  cabal update
  cabal install mtl
</pre>
"""]]
