Resolving dependencies...
cabal: Could not resolve dependencies:
trying: attoparsec-0.13.2.0/installed-9zm... (dependency of http-date-0.0.6.1)
trying: transformers-compat-0.6.0.6 (dependency of scotty-0.11.0)
trying: transformers-compat-0.6.0.6:-two
trying: transformers-compat-0.6.0.6:-three
trying: transformers-compat-0.6.0.6:+mtl
rejecting: transformers-compat-0.6.0.6:-five (conflict: attoparsec =>
transformers==0.5.2.0/installed-0.5..., transformers-compat-0.6.0.6:five =>
transformers>=0.4 && <0.5 || >=0.3 && <0.4 || >=0.2 && <0.3 || >=0.5.3 &&
<0.6)
rejecting: transformers-compat-0.6.0.6:+five (manual flag can only be changed
explicitly)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, smcdel, cudd