Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: ppad-aead-0.3.1 (user goal)
[__1] trying: ppad-poly1305-0.4.1 (dependency of ppad-aead)
[__2] next goal: ppad-fixed (dependency of ppad-poly1305)
[__2] rejecting: ppad-fixed-0.1.2 (conflict: ppad-poly1305 =>
ppad-fixed>=0.1.3 && <0.2)
[__2] skipping: ppad-fixed-0.1.1, ppad-fixed-0.1.0 (has the same
characteristics that caused the previous version to fail: excluded by
constraint '>=0.1.3 && <0.2' from 'ppad-poly1305')
[__2] fail (backjumping, conflict set: ppad-fixed, ppad-poly1305)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: ppad-aead, ppad-poly1305, ppad-fixed