Resolving dependencies... Error: cabal: Could not resolve dependencies: [__0] trying: casr-logbook-0.6.13 (user goal) [__1] trying: text-1.2.5.0/installed-1.2.5.0 (dependency of casr-logbook) [__2] trying: bytestring-0.11.3.1/installed-0.11.3.1 (dependency of text) [__3] next goal: binary (dependency of text) [__3] rejecting: binary-0.8.9.0/installed-0.8.9.0 (conflict: casr-logbook => containers>=0.4 && <0.6, binary => containers==0.6.5.1/installed-0.6.5.1) [__3] rejecting: binary-0.8.9.1, binary-0.8.9.0, binary-0.8.8.0, binary-0.8.7.0, binary-0.8.6.0, binary-0.8.5.1, binary-0.8.5.0, binary-0.8.4.1, binary-0.8.4.0, binary-0.8.3.0, binary-0.8.2.1, binary-0.8.2.0, binary-0.8.1.0, binary-0.8.0.1, binary-0.8.0.0, binary-0.7.6.1, binary-0.7.6.0, binary-0.7.5.0, binary-0.7.4.0, binary-0.7.3.0, binary-0.7.2.3, binary-0.7.2.2, binary-0.7.2.1, binary-0.7.2.0, binary-0.7.1.0, binary-0.7.0.1, binary-0.7.0.0, binary-0.6.4.0, binary-0.6.3.0, binary-0.6.2.0, binary-0.6.1.0, binary-0.6.0.0, binary-0.5.1.1, binary-0.5.1.0, binary-0.5.0.2, binary-0.5.0.1, binary-0.5, binary-0.4.5, binary-0.4.4, binary-0.4.3.1, binary-0.4.3, binary-0.4.2, binary-0.4.1, binary-0.4, binary-0.3, binary-0.2, binary-0.10.0.0, binary-0.9.0.0 (conflict: text => binary==0.8.9.0/installed-0.8.9.0) [__3] fail (backjumping, conflict set: binary, casr-logbook, text) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: bytestring, lens, casr-logbook, base, text, binary Try running with --minimize-conflict-set to improve the error message.