[Haskell-cafe] library conflicts and how to resolve them

Sjoerd Visscher sjoerd at w3future.com
Sun May 6 21:37:58 CEST 2012

My guess would be that persistent indirectly depends on transformers 0.2, since 0.3 is quite new and mtl 2.1.1 doesn't support transformers 0.2. But I can't find which package that is.

On May 6, 2012, at 8:46 PM, Graham Berks wrote:

> Attempting 
> $ cabal install persistent
> Resolving dependencies...
> In order, the following would be installed:
> aeson- (reinstall) changes: mtl-2.1.1 ->
> persistent- (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-  is already installed.
> And as far as I can tell the build of aeson- 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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Sjoerd Visscher

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