Attempting 

$ cabal install persistent

Resolving dependencies...

In order, the following would be installed:

aeson-0.6.0.2 (reinstall) changes: mtl-2.1.1 -> 2.0.1.0

persistent-0.9.0.3 (new package)

cabal: The following packages are likely to be broken by the reinstalls:

buildwrapper-0.5.2

Use --force-reinstalls if you want to install anyway.

Any ideas what is going on ? I believe aeson-0.6.0.2  is already installed.

And as far as I can tell the build of aeson-0.6.0.2 doesn't require that specific version of mtl.

Am I missing something ? Is there a way to force ghc to ignore this ??

Thanks

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