Resolving dependencies... Error: cabal: Could not resolve dependencies: [__0] next goal: postgresql-libpq-pkgconfig (user goal) [__0] rejecting: postgresql-libpq-pkgconfig-0.11 (conflict: pkg-config package libpq>=14.12, not found in the pkg-config database) [__0] rejecting: postgresql-libpq-pkgconfig-0.10 (constraint from user target requires ==0.11) [__0] fail (backjumping, conflict set: postgresql-libpq-pkgconfig) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: postgresql-libpq-pkgconfig