Resolving dependencies... Configuring eithers-0.2.0... Building eithers-0.2.0... Preprocessing library eithers-0.2.0... In-place registering eithers-0.2.0... Running Haddock for eithers-0.2.0... cabal: Haddock's internal GHC version must match the configured GHC version. The GHC version is 7.10.2 but haddock is using GHC version 7.8.3 Creating package registration file: /tmp/pkgConf-eithers-0.2336465782861021530.0 Installing library in /home/builder/hackage-server/build-cache/tmp-install/lib/x86_64-linux-ghc-7.10.2/eithers-0.2.0-9luWEzAUQSF9R9sEYdu2VT Registering eithers-0.2.0... Installed eithers-0.2.0