Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: tttool (user goal)
rejecting: tttool-1.6.1.3, tttool-1.6.1.2, tttool-1.6.1.1, tttool-1.6.1,
tttool-1.6.0.1, tttool-1.6, tttool-1.5.1, tttool-1.5.0.1 (constraint from user
target requires ==1.5)
trying: tttool-1.5
next goal: base (dependency of tttool-1.5)
rejecting: base-4.9.0.0/installed-4.9... (conflict: tttool => base==4.5.* ||
==4.6.* || ==4.7.* || ==4.8.*)
rejecting: base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0,
base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0,
base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0,
base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0,
base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable
package requires installed instance)
Dependency tree exhaustively searched.