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Configuring yst-0.2.2.1...
Building yst-0.2.2.1...
Failed to install yst-0.2.2.1
Build log ( /home/builder/.cabal/logs/yst-0.2.2.1.log ):
cabal: Entering directory '/tmp/cabal-tmp-7818/yst-0.2.2.1'
Configuring yst-0.2.2.1...
Building yst-0.2.2.1...
Preprocessing executable 'yst' for yst-0.2.2.1...
[ 1 of 10] Compiling Yst.Types        ( Yst/Types.hs, dist/build/yst/yst-tmp/Yst/Types.o )
[ 2 of 10] Compiling Yst.Util         ( Yst/Util.hs, dist/build/yst/yst-tmp/Yst/Util.o )

Yst/Util.hs:46:36: error:
    Ambiguous occurrence ‘defaultTimeLocale’
    It could refer to either ‘Data.Time.defaultTimeLocale’,
                             imported from ‘Data.Time’ at Yst/Util.hs:34:1-16
                             (and originally defined in ‘time-1.6.0.1:Data.Time.Format.Locale’)
                          or ‘System.Locale.defaultTimeLocale’,
                             imported from ‘System.Locale’ at Yst/Util.hs:37:23-39
cabal: Leaving directory '/tmp/cabal-tmp-7818/yst-0.2.2.1'
cabal: Error: some packages failed to install:
yst-0.2.2.1 failed during the building phase. The exception was:
ExitFailure 1