Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: debian (user goal)
rejecting: debian-3.87.2, 3.87.1, 3.87, 3.85.2, 3.85, 3.84, 3.83.4.2,
3.83.4.1, 3.83.4, 3.83.3.1, 3.83.3, 3.83, 3.81.3, 3.81, 3.80.1, 3.79.4,
3.79.3, 3.79.2, 3.79.1, 3.70.1, 3.70, 3.69.1, 3.69, 3.66, 3.65.1, 3.65,
3.64.1, 3.64, 3.61, 3.55, 3.54, 3.47, 3.46, 3.40, 3.35, 3.33, 3.32, 3.31,
3.23, 3.21 (global constraint requires ==3.18.1)
trying: debian-3.18.1
next goal: base (dependency of debian-3.18.1)
rejecting: base-4.7.0.1/installed-e4b... (conflict: debian => base>=3 && <4)
rejecting: base-4.8.0.0, 4.7.0.2, 4.7.0.1, 4.7.0.0, 4.6.0.1, 4.6.0.0, 4.5.1.0,
4.5.0.0, 4.4.1.0, 4.4.0.0, 4.3.1.0, 4.3.0.0, 4.2.0.2, 4.2.0.1, 4.2.0.0,
4.1.0.0, 4.0.0.0, 3.0.3.2, 3.0.3.1 (global constraint requires installed
instance)
Dependency tree exhaustively searched.