Resolving dependencies...
Configuring llvm-ffi-3.0.0...
cabal: The pkg-config package 'llvm' version ==3.0 is required but it could
not be found.
Failed to install llvm-ffi-3.0.0
cabal: Error: some packages failed to install:
llvm-ffi-3.0.0 failed during the configure step. The exception was:
ExitFailure 1