Resolving dependencies...
Downloading sessions-2008.5.2...
Configuring sessions-2008.5.2...
Building sessions-2008.5.2...
Preprocessing library sessions-2008.5.2...

Control/Concurrent/Session/Runtime.hs:10:14: Warning:
    -XPatternSignatures is deprecated: use -XScopedTypeVariables or pragma {-# LANGUAGE ScopedTypeVariables #-} instead

Control/Concurrent/Session/Map.hs:6:14: Warning:
    -XPatternSignatures is deprecated: use -XScopedTypeVariables or pragma {-# LANGUAGE ScopedTypeVariables #-} instead

Control/Concurrent/Session/Interleaving.hs:3:14: Warning:
    -XPatternSignatures is deprecated: use -XScopedTypeVariables or pragma {-# LANGUAGE ScopedTypeVariables #-} instead

Control/Concurrent/Session/Pid.hs:4:14: Warning:
    -XPatternSignatures is deprecated: use -XScopedTypeVariables or pragma {-# LANGUAGE ScopedTypeVariables #-} instead

Control/Concurrent/Session.hs:105:8:
    Could not find module `Control.Concurrent.Session.SessionTypeMonad'
    Use -v to see a list of the files searched for.
Failed to install sessions-2008.5.2
cabal: Error: some packages failed to install:
sessions-2008.5.2 failed during the building phase. The exception was:
ExitFailure 1