Resolving dependencies... cabal: Could not resolve dependencies: [__0] trying: tensorflow-proto-0.2.0.0 (user goal) [__1] next goal: proto-lens-protoc (dependency of tensorflow-proto) [__1] rejecting: proto-lens-protoc-0.3.1.0, proto-lens-protoc-0.3.0.0 (conflict: tensorflow-proto => proto-lens-protoc>=0.2.2.1 && <0.3) [__1] trying: proto-lens-protoc-0.2.2.3 [__2] next goal: base (dependency of tensorflow-proto) [__2] rejecting: base-4.11.1.0/installed-4.1... (conflict: proto-lens-protoc => base>=4.8 && <4.11) [__2] rejecting: base-4.11.1.0, base-4.11.0.0, base-4.10.1.0, base-4.10.0.0, base-4.9.1.0, base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0, base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0, base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0, base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0, base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable package requires installed instance) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: base, proto-lens-protoc, tensorflow-proto