Resolving dependencies...
Downloading BNFC-2.6.0.1...
Configuring BNFC-2.6.0.1...
cabal: The field 'build-depends: BNFC' refers to a library which is defined
within the same package. To use this feature the package must specify at least
'cabal-version: >= 1.8'.
Failed to install BNFC-2.6.0.1
cabal: Error: some packages failed to install:
BNFC-2.6.0.1 failed during the configure step. The exception was:
ExitFailure 1