src/Data/Binary/BitBuilder.hs:205:37:
Ambiguous occurrence `unsafePerformIO'
It could refer to either `Foreign.unsafePerformIO',
                         imported from `Foreign' at src/Data/Binary/BitBuilder.hs:38:1-14
                      or `System.IO.Unsafe.unsafePerformIO',
                         imported from `System.IO.Unsafe' at   src/Data/Binary/BitBuilder.hs:42:26-40
                         (and originally defined in `GHC.IO')
Failed to install binary-strict-0.4.8.1
cabal: Error: some packages failed to install:
binary-strict-0.4.8.1 failed during the building phase. The exception was:
ExitFailure 1