Resolving dependencies... cabal: Could not resolve dependencies: next goal: flower (user goal) rejecting: flower-0.7.2 (global constraint requires ==0.7) trying: flower-0.7 trying: base-4.7.0.1/installed-e4b... (dependency of flower-0.7) next goal: binary (dependency of flower-0.7) rejecting: binary-0.7.1.0/installed-0f4..., 0.7.4.0, 0.7.3.0, 0.7.2.3, 0.7.2.2, 0.7.2.1, 0.7.2.0, 0.7.1.0, 0.7.0.1, 0.7.0.0, 0.6.4.0, 0.6.3.0, 0.6.2.0, 0.6.1.0, 0.6.0.0, 0.5.1.1, 0.5.1.0, 0.5.0.2, 0.5.0.1, 0.5 (conflict: flower => binary==0.4.*) trying: binary-0.4.5 trying: binary-0.4.5:+applicative-in-base rejecting: binary-0.4.5:+bytestring-in-base (conflict: base==4.7.0.1/installed-e4b..., binary-0.4.5:bytestring-in-base => base>=2.0 && <2.2) trying: binary-0.4.5:-bytestring-in-base rejecting: binary-0.4.5:+split-base (conflict: base==4.7.0.1/installed-e4b..., binary-0.4.5:split-base => base>=3.0 && <4.7) rejecting: binary-0.4.5:-split-base (conflict: base==4.7.0.1/installed-e4b..., binary-0.4.5:split-base => base<3.0) Dependency tree exhaustively searched.