Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: usb (user goal)
rejecting: usb-1.3.0.4, usb-1.3.0.3, usb-1.3.0.2, usb-1.3.0.1, usb-1.3.0.0,
usb-1.2.0.1, usb-1.2, usb-1.1.0.4, usb-1.1.0.3, usb-1.1.0.2, usb-1.1.0.1,
usb-1.1, usb-1.0, usb-0.8, usb-0.7, usb-0.6.0.8, usb-0.6.0.7, usb-0.6.0.6,
usb-0.6.0.5, usb-0.6.0.4, usb-0.6.0.3, usb-0.6.0.2, usb-0.6.0.1, usb-0.6,
usb-0.5.0.1, usb-0.5, usb-0.4, usb-0.3.1, usb-0.3.0.1, usb-0.3, usb-0.2.0.1
(constraint from user target requires ==0.2)
trying: usb-0.2
next goal: base (dependency of usb-0.2)
rejecting: base-4.9.0.0/installed-4.9... (conflict: usb => base>=4 && <4.2)
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.