Resolving dependencies... cabal: Could not resolve dependencies: [__0] trying: haskoin-store-0.37.1 (user goal) [__1] trying: haskoin-node-0.16.0 (dependency of haskoin-store) [__2] trying: haskoin-core-0.15.0 (dependency of haskoin-store) [__3] next goal: secp256k1-haskell (dependency of haskoin-core) [__3] rejecting: secp256k1-haskell-0.4.0 (conflict: pkg-config package libsecp256k1-any, not found in the pkg-config database) [__3] rejecting: secp256k1-haskell-0.3.1 (conflict: haskoin-core => secp256k1-haskell>=0.4.0) [__3] skipping: secp256k1-haskell-0.3.0, secp256k1-haskell-0.2.5, secp256k1-haskell-0.2.4, secp256k1-haskell-0.2.3, secp256k1-haskell-0.2.2, secp256k1-haskell-0.2.1, secp256k1-haskell-0.2.0, secp256k1-haskell-0.1.8, secp256k1-haskell-0.1.7, secp256k1-haskell-0.1.6, secp256k1-haskell-0.1.5, secp256k1-haskell-0.1.4, secp256k1-haskell-0.1.3, secp256k1-haskell-0.1.2, secp256k1-haskell-0.1.1, secp256k1-haskell-0.1.0 (has the same characteristics that caused the previous version to fail: excluded by constraint '>=0.4.0' from 'haskoin-core') [__3] fail (backjumping, conflict set: haskoin-core, secp256k1-haskell) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: haskoin-store, haskoin-node, haskoin-core, secp256k1-haskell Try running with --minimize-conflict-set to improve the error message.