Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: xmonad (user goal)
rejecting: xmonad-0.12, xmonad-0.11.1, xmonad-0.11, xmonad-0.10, xmonad-0.9.2,
xmonad-0.9.1, xmonad-0.9, xmonad-0.8.1, xmonad-0.8, xmonad-0.7, xmonad-0.6,
xmonad-0.5 (constraint from user target requires ==0.4.1)
trying: xmonad-0.4.1
trying: base-4.9.0.0/installed-4.9... (dependency of xmonad-0.4.1)
next goal: X11 (dependency of xmonad-0.4.1)
rejecting: X11-1.7, X11-1.6.1.2, X11-1.6.1.1, X11-1.6.1, X11-1.6.0.2,
X11-1.6.0.1, X11-1.6.0, X11-1.5.0.1, X11-1.5.0.0, X11-1.4.6.1, X11-1.4.6,
X11-1.4.5, X11-1.4.4, X11-1.4.3, X11-1.4.2, X11-1.4.1, X11-1.4.0 (conflict:
xmonad => X11==1.3.0)
rejecting: X11-1.3.0 (conflict: base==4.9.0.0/installed-4.9..., X11 => base<4)
rejecting: X11-1.2.3.1, X11-1.2.3, X11-1.2.2, X11-1.2 (conflict: xmonad =>
X11==1.3.0)
Dependency tree exhaustively searched.