Resolving dependencies...
Downloading bitarray-0.0.1.1...
Configuring bitarray-0.0.1.1...
Building bitarray-0.0.1.1...
Preprocessing library bitarray-0.0.1.1...
[1 of 4] Compiling Data.BitArray.Immutable ( Data/BitArray/Immutable.hs, dist/build/Data/BitArray/Immutable.o )
[2 of 4] Compiling Data.BitArray.ST ( Data/BitArray/ST.hs, dist/build/Data/BitArray/ST.o )

Data/BitArray/ST.hs:109:3:
    Ambiguous occurrence `unsafeThaw'
    It could refer to either `Data.Array.ST.unsafeThaw',
                             imported from `Data.Array.ST' at Data/BitArray/ST.hs:29:1-20
                             (and originally defined in `Data.Array.MArray')
                          or `Data.Array.Unsafe.unsafeThaw',
                             imported from `Data.Array.Unsafe' at Data/BitArray/ST.hs:30:1-24
                             (and originally defined in `Data.Array.Base')

Data/BitArray/ST.hs:117:3:
    Ambiguous occurrence `unsafeFreeze'
    It could refer to either `Data.Array.ST.unsafeFreeze',
                             imported from `Data.Array.ST' at Data/BitArray/ST.hs:29:1-20
                             (and originally defined in `Data.Array.MArray')
                          or `Data.Array.Unsafe.unsafeFreeze',
                             imported from `Data.Array.Unsafe' at Data/BitArray/ST.hs:30:1-24
                             (and originally defined in `Data.Array.Base')
Failed to install bitarray-0.0.1.1
cabal: Error: some packages failed to install:
bitarray-0.0.1.1 failed during the building phase. The exception was:
ExitFailure 1