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Configuring yst-0.2...
Building yst-0.2...
Failed to install yst-0.2
Build log ( /home/builder/.cabal/logs/yst-0.2.log ):
cabal: Entering directory '/tmp/cabal-tmp-23858/yst-0.2'
Configuring yst-0.2...
Building yst-0.2...
Preprocessing executable 'yst' for yst-0.2...
[ 1 of 10] Compiling Yst.Types        ( Yst/Types.hs, dist/build/yst/yst-tmp/Yst/Types.o )

Yst/Types.hs:22:1: warning: [-Wunused-imports]
    The import of ‘System.FilePath’ is redundant
      except perhaps to import instances from ‘System.FilePath’
    To import instances alone, use: import System.FilePath()
[ 2 of 10] Compiling Yst.Util         ( Yst/Util.hs, dist/build/yst/yst-tmp/Yst/Util.o )

Yst/Util.hs:25:1: error:
    Failed to load interface for ‘System.IO.UTF8’
    Perhaps you meant
      System.IO.Temp (needs flag -package-key temporary-1.2.0.4)
    Use -v to see a list of the files searched for.
cabal: Leaving directory '/tmp/cabal-tmp-23858/yst-0.2'
cabal: Error: some packages failed to install:
yst-0.2 failed during the building phase. The exception was:
ExitFailure 1