git-annex/doc/forum/update_via_cabal_fails.mdwn
https://www.google.com/accounts/o8/id?id=AItOawnX1msQxnLoSeu7q-i-c9BWghonsN7Qmns 6a170c6671
2014-07-08 06:38:04 +00:00

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I tried to update git-annex via cabal. It fails due to lens not installing:
juh@sokrates:~$ cabal update
Downloading the latest package list from hackage.haskell.org
juh@sokrates:~$ cabal install git-annex
Resolving dependencies...
In order, the following will be installed:
lens-4.2 (new version)
DAV-0.6.2 (reinstall) changes: http-client-0.3.1.1 -> 0.3.3.1,
http-client-tls-0.2.1.1 added, http-types-0.8.4 -> 0.8.5, lens-4.1.2 -> 4.2,
network-2.4.1.2 added, optparse-applicative-0.7.0.2 added, xml- conduit-1.2.0.1
-> 1.2.0.2, xml-hamlet-0.4.0.8 added
git-annex-5.20140707 (new package)
Warning: Note that reinstalls are always dangerous. Continuing anyway...
[1 of 1] Compiling Main ( /tmp/lens-4.2-3107/lens-4.2/Setup. lhs, /tmp/lens-4.2-3107/lens-4.2/dist/setup/Main.o )
Linking /tmp/lens-4.2-3107/lens-4.2/dist/setup/setup ...
Configuring lens-4.2...
Building lens-4.2...
Preprocessing library lens-4.2...
src/Control/Lens/Internal/Zoom.hs:47:8:
Could not find module `Control.Monad.Trans.Except'
Perhaps you meant
Control.Monad.Trans.Cont (from transformers-0.3.0.0)
Control.Monad.Trans.Error (from transformers-0.3.0.0)
Control.Monad.Trans.List (from transformers-0.3.0.0)
Use -v to see a list of the files searched for.
Failed to install lens-4.2
cabal: Error: some packages failed to install:
DAV-0.6.2 depends on lens-4.2 which failed to install.
git-annex-5.20140707 depends on lens-4.2 which failed to install.
lens-4.2 failed during the building phase. The exception was:
ExitFailure 1
I am not an experienced user of cabal. So any hints to solve the conflicts are appreciated.