Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: ismtp (user goal)
rejecting: ismtp-4.0.2 (global constraint requires ==4.0.1)
trying: ismtp-4.0.1
trying: vector-0.10.12.3 (dependency of ismtp-4.0.1)
trying: primitive-0.6 (dependency of vector-0.10.12.3)
trying: transformers-0.3.0.0/installed-16a... (dependency of primitive-0.6)
trying: netlines-1.0.0 (dependency of ismtp-4.0.1)
trying: HTF-0.12.2.4 (dependency of netlines-1.0.0)
trying: monad-control-1.0.0.4 (dependency of HTF-0.12.2.4)
trying: transformers-compat-0.4.0.4 (dependency of monad-control-1.0.0.4)
trying: transformers-compat-0.4.0.4:-two
rejecting: transformers-compat-0.4.0.4:-three (conflict:
transformers==0.3.0.0/installed-16a..., transformers-compat-0.4.0.4:three =>
transformers>=0.4.1 && <0.5)
rejecting: transformers-compat-0.4.0.4:+three (manual flag can only be changed
explicitly)
Dependency tree exhaustively searched.