Resolving dependencies... cabal: Could not resolve dependencies: next goal: network-bitcoin (user goal) rejecting: network-bitcoin-1.8.1, network-bitcoin-1.8.0, network-bitcoin-1.7.2, network-bitcoin-1.7.1, network-bitcoin-1.7.0, network-bitcoin-1.6.0, network-bitcoin-1.5.2, network-bitcoin-1.5.1, network-bitcoin-1.5.0, network-bitcoin-1.4.0, network-bitcoin-1.3.0, network-bitcoin-1.2.2, network-bitcoin-1.2.1, network-bitcoin-1.2.0, network-bitcoin-1.1.0, network-bitcoin-1.0.2, network-bitcoin-1.0.1, network-bitcoin-1.0.0, network-bitcoin-0.1.5, network-bitcoin-0.1.4, network-bitcoin-0.1.3, network-bitcoin-0.1.2, network-bitcoin-0.1.1 (constraint from user target requires ==0.1.0) trying: network-bitcoin-0.1.0 next goal: base (dependency of network-bitcoin-0.1.0) rejecting: base-4.9.0.0/installed-4.9... (conflict: network-bitcoin => base==4.3.*) rejecting: 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) Dependency tree exhaustively searched.