doc/bugs/Compilation_error_when_building_version_5.20140402_in_cabal_sandbox.mdwn

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+### Please describe the problem.
+[[!format sh """
+cabal install -O2 -j1 -f-webdav -f-s3 git-annex
+Resolving dependencies...
+Configuring dns-1.2.0...
+Building dns-1.2.0...
+Preprocessing library dns-1.2.0...
+
+Network/DNS/Decode.hs:15:8:
+    Could not find module `Data.Conduit.Network'
+    It is a member of the hidden package `conduit-extra-1.1.0'.
+    Perhaps you need to add `conduit-extra' to the build-depends in your .cabal file.
+    Use -v to see a list of the files searched for.
+Failed to install dns-1.2.0
+cabal: Error: some packages failed to install:
+dns-1.2.0 failed during the building phase. The exception was:
+ExitFailure 1
+git-annex-5.20140402 depends on dns-1.2.0 which failed to install.
+"""]]
+
+### What steps will reproduce the problem?
+
+[[!format sh """
+cabal update
+mkdir -p ~/haskell/git-annex
+cd ~/haskell/git-annex
+cabal sandbox init
+cabal install -O2 -j1 -f-webdav -f-s3 c2hs git-annex
+"""]]
+### What version of git-annex are you using? On what operating system?
+
+5.20140402, Gentoo Linux
+
+### Please provide any additional information below.
+