Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: xmobar (user goal)
rejecting: xmobar-0.23.1, 0.23, 0.22.1, 0.22, 0.21, 0.20.1, 0.20, 0.19, 0.18,
0.17, 0.16 (global constraint requires ==0.15)
trying: xmobar-0.15
trying: base-4.8.1.0/installed-4f7... (dependency of xmobar-0.15)
next goal: mtl (dependency of xmobar-0.15)
rejecting: mtl-2.2.1, 2.2.0.1, 2.2, 2.1.3.1, 2.1.2, 2.1.1, 2.1 (conflict:
xmobar => mtl==2.0.*)
trying: mtl-2.0.1.1
next goal: transformers (dependency of mtl-2.0.1.1)
rejecting: transformers-0.4.2.0/installed-21d..., 0.4.3.0, 0.4.2.0, 0.4.1.0,
0.3.0.0 (conflict: mtl => transformers==0.2.*)
trying: transformers-0.2.2.1
rejecting: transformers-0.2.2.1:+applicativeinbase (conflict:
base==4.8.1.0/installed-4f7..., transformers-0.2.2.1:applicativeinbase =>
base>=2 && <4.8)
rejecting: transformers-0.2.2.1:-applicativeinbase (conflict:
base==4.8.1.0/installed-4f7..., transformers-0.2.2.1:applicativeinbase =>
base>=1.0 && <2)
Dependency tree exhaustively searched.