Resolving dependencies...
cabal: Could not resolve dependencies:
trying: base-4.9.0.0/installed-4.9... (dependency of happs-tutorial-0.7.1)
next goal: happstack-helpers (dependency of happs-tutorial-0.7.1)
rejecting: happstack-helpers-0.56, happstack-helpers-0.54,
happstack-helpers-0.53, happstack-helpers-0.52, happstack-helpers-0.51,
happstack-helpers-0.50, happstack-helpers-0.49, happstack-helpers-0.48,
happstack-helpers-0.47, happstack-helpers-0.46, happstack-helpers-0.45,
happstack-helpers-0.44, happstack-helpers-0.43, happstack-helpers-0.42,
happstack-helpers-0.30, happstack-helpers-0.22.1, happstack-helpers-0.22,
happstack-helpers-0.21, happstack-helpers-0.20 (conflict: happs-tutorial =>
happstack-helpers>=0.11 && <0.20)
trying: happstack-helpers-0.11
trying: process-1.4.2.0/installed-1.4... (dependency of happstack-util-6.0.3)
next goal: haskell98 (dependency of happstack-helpers-0.11)
rejecting: haskell98-2.0.0.3 (conflict: base==4.9.0.0/installed-4.9...,
haskell98 => base>=4.7 && <4.8)
rejecting: haskell98-2.0.0.2 (conflict: base==4.9.0.0/installed-4.9...,
haskell98 => base==4.6.*)
rejecting: haskell98-2.0.0.1, haskell98-2.0.0.0 (conflict: process =>
directory==1.2.6.2/installed-1.2..., haskell98 => directory>=1.1 && <1.2)
rejecting: haskell98-1.1.0.1, haskell98-1.1.0.0, haskell98-1.0.1.1 (conflict:
base==4.9.0.0/installed-4.9..., haskell98 => base>=3 && <4.6)
rejecting: haskell98-1.0.1.0 (conflict: base==4.9.0.0/installed-4.9...,
haskell98 => base<4.6)
rejecting: haskell98-1.0 (conflict: base==4.9.0.0/installed-4.9..., haskell98
=> base<4.3)
Dependency tree exhaustively searched.