Resolving dependencies... cabal: Could not resolve dependencies: next goal: hemokit (user goal) rejecting: hemokit-0.6.6, hemokit-0.6.5 (constraint from user target requires ==0.6.4) trying: hemokit-0.6.4 trying: base-4.9.0.0/installed-4.9... (dependency of hemokit-0.6.4) trying: transformers-0.5.2.0/installed-0.5... (dependency of hemokit-0.6.4) next goal: optparse-applicative (dependency of hemokit-0.6.4) rejecting: optparse-applicative-0.13.0.0, optparse-applicative-0.12.1.0, optparse-applicative-0.12.0.0, optparse-applicative-0.11.0.2, optparse-applicative-0.11.0.1, optparse-applicative-0.11.0, optparse-applicative-0.10.0 (conflict: hemokit => optparse-applicative>=0.7.0 && <0.10.0) rejecting: optparse-applicative-0.9.1.1, optparse-applicative-0.9.1, optparse-applicative-0.9.0 (conflict: base==4.9.0.0/installed-4.9..., optparse-applicative => base>=4 && <4.8) rejecting: optparse-applicative-0.8.1, optparse-applicative-0.8.0.1, optparse-applicative-0.8.0, optparse-applicative-0.7.0.2, optparse-applicative-0.7.0.1, optparse-applicative-0.7.0 (conflict: transformers==0.5.2.0/installed-0.5..., optparse-applicative => transformers>=0.2 && <0.4) rejecting: optparse-applicative-0.6.0, optparse-applicative-0.5.2.1, optparse-applicative-0.5.2, optparse-applicative-0.5.1, optparse-applicative-0.5.0, optparse-applicative-0.4.3, optparse-applicative-0.4.2, optparse-applicative-0.4.1, optparse-applicative-0.4.0, optparse-applicative-0.3.2, optparse-applicative-0.3.1, optparse-applicative-0.3.0, optparse-applicative-0.2.0, optparse-applicative-0.1.1, optparse-applicative-0.1.0, optparse-applicative-0.0.1 (conflict: hemokit => optparse-applicative>=0.7.0 && <0.10.0) Dependency tree exhaustively searched.