Resolving dependencies...
Downloading yi-0.5.0.1...
Configuring yi-0.5.0.1...
Building yi-0.5.0.1...
Failed to install yi-0.5.0.1
Build log ( /home/builder/.cabal/logs/yi-0.5.0.1.log ):
cabal: Entering directory '/tmp/cabal-tmp-6324/yi-0.5.0.1'
Configuring yi-0.5.0.1...
Building yi-0.5.0.1...
Preprocessing library yi-0.5.0.1...

Yi/Core.hs:1:14: warning:
    -XPatternSignatures is deprecated: use -XScopedTypeVariables or pragma {-# LANGUAGE ScopedTypeVariables #-} instead

Yi/Eval.hs:1:14: warning:
    -XPatternSignatures is deprecated: use -XScopedTypeVariables or pragma {-# LANGUAGE ScopedTypeVariables #-} instead

Yi/History.hs:1:14: warning:
    -XPatternSignatures is deprecated: use -XScopedTypeVariables or pragma {-# LANGUAGE ScopedTypeVariables #-} instead
[ 1 of 95] Compiling Yi.UI.Common[boot] ( Yi/UI/Common.hs-boot, dist/build/Yi/UI/Common.o-boot )

Yi/UI/Common.hs-boot:1:8: error:
    Failed to load interface for ‘Prelude’
    It is a member of the hidden package ‘base-4.9.0.0’.
    Perhaps you need to add ‘base’ to the build-depends in your .cabal file.
    Use -v to see a list of the files searched for.
cabal: Leaving directory '/tmp/cabal-tmp-6324/yi-0.5.0.1'
cabal: Error: some packages failed to install:
yi-0.5.0.1 failed during the building phase. The exception was:
ExitFailure 1