It seems like you have time-1.4.2 installed, the latest GHC (7.10) comes with time 1.5.*. Are you sure you are on 7.10?
The core of the problem is that hakyll needs time >= 1.5, and unix is using the pre-installed time-1.4.2. This is rejected because only one version of a library can be used in the same install plan. As the error message suggests you can you increase the backjump limit so I'd try that first. I typically pass --reorder-goals --max-backjumps=-1 to cabal-install. Running this sometimes takes a long time, but it will finish eventually. You can also try installing an older version of hakyll that works with time-1.4.2 (see the hackage page for info on older versions). Lastly, are you using a sandbox? It also helps with reducing problems. I never install anything in the global or user level package db, only in sandboxes. HTH, Adam On Sat, Aug 1, 2015 at 2:36 PM, Peder Jakobsen <pjakob...@gmail.com> wrote: > Hi, > > Been with Haskell just for few days, and thought it would be a good > exercise to run a static site generator to get familiar with various tools, > and I’m already running into “cabal hell” I think. :( > > > $ cabal install hakyll > Resolving dependencies... > cabal: Could not resolve dependencies: > trying: hakyll-4.7.2.0 (user goal) > next goal: time (dependency of hakyll-4.7.2.0) > rejecting: time-1.4.2/installed-d67... (conflict: hakyll => time>=1.5 && > <1.6) > trying: time-1.5.0.1 > trying: process-1.2.0.0/installed-3a4... (dependency of hakyll-4.7.2.0) > next goal: unix (dependency of process-1.2.0.0/installed-3a4...) > rejecting: unix-2.7.0.1/installed-8ad... (conflict: time==1.5.0.1, unix => > time==1.4.2/installed-d67...) > rejecting: unix-2.7.1.0, 2.7.0.1, 2.7.0.0, 2.6.0.1, 2.6.0.0, 2.5.1.1, > 2.5.1.0, > 2.5.0.0, 2.4.2.0, 2.4.1.0, 2.4.0.2, 2.4.0.1, 2.4.0.0, 2.3.2.0, 2.3.1.0, > 2.3.0.0, 2.2.0.0, 2.0 (conflict: process => unix==2.7.0.1/installed-8ad.. > .) > Backjump limit reached (change with --max-backjumps). > > > I’m running OS X Yosemite 10.2.2 with all the latest versions of Haskell > and cabal. > > Thanks you for listening. :) > > Peder > > _______________________________________________ > cabal-devel mailing list > cabal-devel@haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/cabal-devel > >
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