Resolving dependencies...
Configuring mtl-1.1.1.1...
Building mtl-1.1.1.1...
Preprocessing library mtl-1.1.1.1...
[ 1 of 21] Compiling Control.Monad.Identity ( Control/Monad/Identity.hs, dist/build/Control/Monad/Identity.o )
[ 2 of 21] Compiling Control.Monad.Writer.Class ( Control/Monad/Writer/Class.hs, dist/build/Control/Monad/Writer/Class.o )
[ 3 of 21] Compiling Control.Monad.Error.Class ( Control/Monad/Error/Class.hs, dist/build/Control/Monad/Error/Class.o )
[ 4 of 21] Compiling Control.Monad.State.Class ( Control/Monad/State/Class.hs, dist/build/Control/Monad/State/Class.o )
[ 5 of 21] Compiling Control.Monad.Reader.Class ( Control/Monad/Reader/Class.hs, dist/build/Control/Monad/Reader/Class.o )
[ 6 of 21] Compiling Control.Monad.RWS.Class ( Control/Monad/RWS/Class.hs, dist/build/Control/Monad/RWS/Class.o )
[ 7 of 21] Compiling Control.Monad.Trans ( Control/Monad/Trans.hs, dist/build/Control/Monad/Trans.o )
[ 8 of 21] Compiling Control.Monad.Cont.Class ( Control/Monad/Cont/Class.hs, dist/build/Control/Monad/Cont/Class.o )
[ 9 of 21] Compiling Control.Monad.Reader ( Control/Monad/Reader.hs, dist/build/Control/Monad/Reader.o )
[10 of 21] Compiling Control.Monad.Error ( Control/Monad/Error.hs, dist/build/Control/Monad/Error.o )

Control/Monad/Error.hs:73:21: Not in scope: `catch'

Control/Monad/Error.hs:77:18: Not in scope: `catch'
Failed to install mtl-1.1.1.1
cabal: Error: some packages failed to install:
NXT-0.1.4 depends on mtl-1.1.1.1 which failed to install.
mtl-1.1.1.1 failed during the building phase. The exception was:
ExitFailure 1