Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: VKHS (user goal)
rejecting: VKHS-0.5.7, 0.5.6, 0.5.5, 0.5.4, 0.5.3, 0.5.2, 0.5.1 (global
constraint requires ==0.5.0)
trying: VKHS-0.5.0
trying: optparse-applicative-0.12.0.0 (dependency of VKHS-0.5.0)
trying: transformers-compat-0.4.0.4 (dependency of
optparse-applicative-0.12.0.0)
trying: transformers-compat-0.4.0.4:-two
trying: transformers-compat-0.4.0.4:-three
next goal: transformers (dependency of VKHS-0.5.0)
rejecting: transformers-0.4.2.0/installed-21d..., 0.4.3.0, 0.4.2.0, 0.4.1.0
(conflict: VKHS => transformers==0.3.*)
rejecting: transformers-0.3.0.0 (conflict: transformers-compat-0.4.0.4:three
=> transformers>=0.4.1 && <0.5)
rejecting: transformers-0.2.2.1, 0.2.2.0, 0.2.1.0, 0.2.0.0, 0.1.4.0, 0.1.3.0,
0.1.1.0, 0.1.0.1, 0.1.0.0, 0.0.1.0, 0.0.0.0, 0.4.0.0 (conflict: VKHS =>
transformers==0.3.*)
Dependency tree exhaustively searched.