Resolving dependencies...
Downloading unlambda-0.1.2...
Configuring unlambda-0.1.2...
Building unlambda-0.1.2...
Preprocessing library unlambda-0.1.2...
[1 of 1] Compiling Language.Unlambda ( Language/Unlambda.hs, dist/build/Language/Unlambda.o )

Language/Unlambda.hs:134:15: Not in scope: `catch'
Failed to install unlambda-0.1.2
cabal: Error: some packages failed to install:
unlambda-0.1.2 failed during the building phase. The exception was:
ExitFailure 1