Resolving dependencies...
Configuring old-locale-1.0.0.7...
Building old-locale-1.0.0.7...
Installed old-locale-1.0.0.7
Configuring rfc3339-1.0.2...
Building rfc3339-1.0.2...
Failed to install rfc3339-1.0.2
Build log ( /home/builder/.cabal/logs/rfc3339-1.0.2.log ):
cabal: Entering directory '/tmp/cabal-tmp-8467/rfc3339-1.0.2'
Configuring rfc3339-1.0.2...
Building rfc3339-1.0.2...
Preprocessing library rfc3339-1.0.2...
[1 of 1] Compiling Data.Time.RFC3339 ( Data/Time/RFC3339.hs, dist/build/Data/Time/RFC3339.o )

Data/Time/RFC3339.hs:45:16: error:
    Ambiguous occurrence ‘defaultTimeLocale’
    It could refer to either ‘Data.Time.Format.defaultTimeLocale’,
                             imported from ‘Data.Time.Format’ at Data/Time/RFC3339.hs:19:1-23
                             (and originally defined in ‘time-1.6.0.1:Data.Time.Format.Locale’)
                          or ‘System.Locale.defaultTimeLocale’,
                             imported from ‘System.Locale’ at Data/Time/RFC3339.hs:23:1-20

Data/Time/RFC3339.hs:58:25: error:
    Ambiguous occurrence ‘defaultTimeLocale’
    It could refer to either ‘Data.Time.Format.defaultTimeLocale’,
                             imported from ‘Data.Time.Format’ at Data/Time/RFC3339.hs:19:1-23
                             (and originally defined in ‘time-1.6.0.1:Data.Time.Format.Locale’)
                          or ‘System.Locale.defaultTimeLocale’,
                             imported from ‘System.Locale’ at Data/Time/RFC3339.hs:23:1-20
cabal: Leaving directory '/tmp/cabal-tmp-8467/rfc3339-1.0.2'
cabal: Error: some packages failed to install:
rfc3339-1.0.2 failed during the building phase. The exception was:
ExitFailure 1