Resolving dependencies... cabal: Could not resolve dependencies: next goal: yesod-examples (user goal) rejecting: yesod-examples-0.9.0.1, 0.9.0, 0.8.0.3, 0.8.0.2, 0.8.0.1, 0.8.0, 0.7.0.1, 0.7.0, 0.6.1, 0.6.0.2, 0.6.0.1 (global constraint requires ==0.6.0) trying: yesod-examples-0.6.0 trying: hamlet-1.2.0 (dependency of yesod-examples-0.6.0) trying: shakespeare-2.0.7 (dependency of hamlet-1.2.0) trying: directory-1.2.2.0/installed-258... (dependency of shakespeare-2.0.7) next goal: unix (dependency of directory-1.2.2.0/installed-258...) rejecting: unix-2.7.1.0/installed-643... (conflict: unix => bytestring==0.10.6.0/installed-236..., yesod-examples => bytestring>=0.9 && <0.10) rejecting: unix-2.7.1.0, 2.7.0.1, 2.7.0.0, 2.6.0.1, 2.6.0.0, 2.5.1.1, 2.5.1.0, 2.5.0.0, 2.4.2.0, 2.4.1.0, 2.4.0.2, 2.4.0.1, 2.4.0.0, 2.3.2.0, 2.3.1.0, 2.3.0.0, 2.2.0.0, 2.0 (conflict: directory => unix==2.7.1.0/installed-643...) Backjump limit reached (change with --max-backjumps).