Hi. > $ 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.
Yes. > And as far as I can tell the build of aeson-0.6.0.2 doesn't require that > specific version of mtl. It doesn't, otherwise it couldn't already be installed. Something persistent depends on in the selected plan depends on mtl-2.0.1.0, and therefore implies the reinstall. It'd be interesting to see the trace of the solver (pass -v3 to the cabal command). You could also try what adding --constraint="mtl == 2.1.1" yields. Cheers, Andres _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
