~$ cabal install usb
Resolving dependencies...
Configuring usb-1.3.0.0...
Building usb-1.3.0.0...
Failed to install usb-1.3.0.0
Build log ( /home/h/.cabal/logs/usb-1.3.0.0.log ):
[1 of 1] Compiling Main             ( /tmp/usb-1.3.0.0-12385/usb-1.3.0.0/dist/setup/setup.hs, /tmp/usb-1.3.0.0-12385/usb-1.3.0.0/dist/setup/Main.o )
Linking /tmp/usb-1.3.0.0-12385/usb-1.3.0.0/dist/setup/setup ...
Configuring usb-1.3.0.0...
Building usb-1.3.0.0...
Preprocessing library usb-1.3.0.0...
[ 1 of 15] Compiling SystemEventManager ( SystemEventManager.hs, dist/build/SystemEventManager.o )
[ 2 of 15] Compiling Event            ( Event.hs, dist/build/Event.o )
[ 3 of 15] Compiling Poll             ( dist/build/Poll.hs, dist/build/Poll.o )
[ 4 of 15] Compiling Utils            ( Utils.hs, dist/build/Utils.o )
[ 5 of 15] Compiling System.USB.Base  ( System/USB/Base.hs, dist/build/System/USB/Base.o )

System/USB/Base.hs:112:55:
    Module `Control.Concurrent.MVar' does not export `withMVarMasked'
cabal: Error: some packages failed to install:
usb-1.3.0.0 failed during the building phase. The exception was:
ExitFailure 1