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Configuring aws-sign4-0.0.0.1...
Building aws-sign4-0.0.0.1...
Failed to install aws-sign4-0.0.0.1
Build log ( /home/builder/.cabal/logs/aws-sign4-0.0.0.1.log ):
cabal: Entering directory '/tmp/cabal-tmp-21218/aws-sign4-0.0.0.1'
Configuring aws-sign4-0.0.0.1...
Building aws-sign4-0.0.0.1...
Preprocessing library aws-sign4-0.0.0.1...
[1 of 1] Compiling Aws.Sign4        ( Aws/Sign4.hs, dist/build/Aws/Sign4.o )

Aws/Sign4.hs:154:24: error:
    Ambiguous occurrence ‘defaultTimeLocale’
    It could refer to either ‘Data.Time.defaultTimeLocale’,
                             imported from ‘Data.Time’ at Aws/Sign4.hs:23:1-26
                             (and originally defined in ‘time-1.6.0.1:Data.Time.Format.Locale’)
                          or ‘System.Locale.defaultTimeLocale’,
                             imported from ‘System.Locale’ at Aws/Sign4.hs:29:1-30
cabal: Leaving directory '/tmp/cabal-tmp-21218/aws-sign4-0.0.0.1'
cabal: Error: some packages failed to install:
aws-sign4-0.0.0.1 failed during the building phase. The exception was:
ExitFailure 1