Resolving dependencies...
Configuring mtl-2.2.1...
cabal: '/opt/ghc/7.10.2/bin/ghc-pkg' exited with an error:
ghc-pkg: /home/builder/hackage-server/build-cache/tmp-install/packages.db:
getDirectoryContents: does not exist (No such file or directory)
Failed to install mtl-2.2.1
cabal: Error: some packages failed to install:
BNFC-2.8 depends on mtl-2.2.1 which failed to install.
cubical-0.2.0 depends on mtl-2.2.1 which failed to install.
mtl-2.2.1 failed during the configure step. The exception was:
ExitFailure 1