Resolving dependencies...
Downloading caf-0.0.2...
Configuring caf-0.0.2...
Building caf-0.0.2...
Preprocessing library caf-0.0.2...

Control/Concurrent/Futures.hs:70:8:
    Could not find module `Control.Concurrent.Futures.Barrier'
    Use -v to see a list of the files searched for.
Failed to install caf-0.0.2
cabal: Error: some packages failed to install:
caf-0.0.2 failed during the building phase. The exception was:
ExitFailure 1