Resolving dependencies... cabal: Could not resolve dependencies: next goal: MFlow (user goal) rejecting: MFlow-0.4.6.0, 0.4.5.13, 0.4.5.12, 0.4.5.11, 0.4.5.10, 0.4.5.9, 0.4.5.8, 0.4.5.7, 0.4.5.6, 0.4.5.5, 0.4.5.4, 0.4.5.3, 0.4.5.2, 0.4.5.1, 0.4.5, 0.4.4, 0.4.2, 0.4.1, 0.4.0, 0.3.3, 0.3.2.0, 0.3.1.1, 0.3.1.0, 0.3.0.2, 0.3.0.1, 0.3.0.0, 0.2.0.9, 0.2.0.8, 0.2.0.7, 0.2.0.6, 0.2.0.5, 0.2.0.4, 0.2.0.3, 0.2.0.2, 0.2.0.1, 0.2.0.0, 0.1.5.5, 0.1.5.4, 0.1.5.3, 0.1.5.2, 0.1.5.1 (global constraint requires ==0.1.5.0) trying: MFlow-0.1.5.0 trying: base-4.8.1.0/installed-4f7... (dependency of MFlow-0.1.5.0) next goal: hack-handler-simpleserver (dependency of MFlow-0.1.5.0) rejecting: hack-handler-simpleserver-0.2.2, 0.2.1, 0.2.0.2 (conflict: network==2.6.2.1, hack-handler-simpleserver => network>=2.2.1.2 && <2.4) rejecting: hack-handler-simpleserver-0.2.0.1, 0.2.0 (conflict: network==2.6.2.1, hack-handler-simpleserver => network>=2.2.1.2 && <2.3) trying: hack-handler-simpleserver-0.0.1 next goal: web-encodings (dependency of hack-handler-simpleserver-0.0.1) rejecting: web-encodings-0.3.0.9, 0.3.0.8 (conflict: binary => bytestring==0.10.6.0/installed-236..., web-encodings => bytestring>=0.9.1.4 && <0.10) rejecting: web-encodings-0.3.0.7 (conflict: unix => time==1.5.0.1/installed-c20..., web-encodings => time>=1.1.2.4 && <1.4) rejecting: web-encodings-0.3.0.6, 0.3.0.5, 0.3.0.4, 0.3.0.3, 0.3.0.2, 0.3.0.1, 0.3.0, 0.2.6.2 (conflict: unix => time==1.5.0.1/installed-c20..., web-encodings => time>=1.1.2.4 && <1.3) rejecting: web-encodings-0.2.6.1, 0.2.6, 0.2.5, 0.2.4, 0.2.3, 0.2.2, 0.2.1, 0.2.0.1, 0.2.0 (conflict: unix => time==1.5.0.1/installed-c20..., web-encodings => time>=1.1.2.4 && <1.2) trying: web-encodings-0.0.1 next goal: bytestring-class (dependency of web-encodings-0.0.1) rejecting: bytestring-class-0.0.0.1, 0.0.0 (conflict: base==4.8.1.0/installed-4f7..., bytestring-class => base<4.4) Backjump limit reached (change with --max-backjumps).