Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: happs-tutorial (user goal)
rejecting: happs-tutorial-0.9.5, 0.9.4, 0.9.3, 0.9.2, 0.9.1, 0.9.0, 0.8.1
(global constraint requires ==0.8)
trying: happs-tutorial-0.8
trying: base-4.7.0.1/installed-e4b... (dependency of happs-tutorial-0.8)
trying: happstack-helpers-0.56 (dependency of happs-tutorial-0.8)
next goal: haskell98 (dependency of happstack-helpers-0.56)
rejecting: haskell98-2.0.0.3/installed-85b..., 2.0.0.3, 2.0.0.2, 2.0.0.1,
2.0.0.0 (conflict: happstack-helpers => haskell98>=1.0.0.0 && <2.0.0.0)
rejecting: haskell98-1.1.0.1, 1.1.0.0, 1.0.1.1 (conflict:
base==4.7.0.1/installed-e4b..., haskell98 => base>=3 && <4.6)
rejecting: haskell98-1.0.1.0 (conflict: base==4.7.0.1/installed-e4b...,
haskell98 => base<4.6)
rejecting: haskell98-1.0 (conflict: happstack-helpers => haskell98>=1.0.0.0 &&
<2.0.0.0)
Backjump limit reached (change with --max-backjumps).