Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] next goal: libffi-clib (user goal)
[__0] rejecting: libffi-clib-3.5.2 (unsupported spec-version 3.12)
[__0] fail (backjumping, conflict set: libffi-clib)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: libffi-clib