Resolving dependencies...
Downloading timestamper-1.0.3...
Configuring timestamper-1.0.3...
Building timestamper-1.0.3...
Preprocessing executable 'timestamper' for timestamper-1.0.3...
[1 of 1] Compiling Main             ( Main.lhs, dist/build/timestamper/timestamper-tmp/Main.o )

Main.lhs:20:42:
    Not in scope: ‘defaultTimeLocale’
    Perhaps you meant ‘Locale.defaultTimeLocale’ (imported from System.Locale)
Failed to install timestamper-1.0.3
cabal: Error: some packages failed to install:
timestamper-1.0.3 failed during the building phase. The exception was:
ExitFailure 1