Resolving dependencies...
Configuring mtl-2.2.1...
Building mtl-2.2.1...
Installed mtl-2.2.1
Configuring BNFC-2.6.0.1...
Failed to install BNFC-2.6.0.1
Build log ( /home/builder/.cabal/logs/BNFC-2.6.0.1.log ):
cabal: Entering directory '/tmp/cabal-tmp-5740/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'.
cabal: Leaving directory '/tmp/cabal-tmp-5740/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