Warning: The install command is a part of the legacy v1 style of cabal usage.

Please switch to using either the new project style and the new-install
command or the legacy v1-install alias as new-style projects will become the
default in the next version of cabal-install. Please file a bug if you cannot
replicate a working v1- use case with the new-style commands.

For more information, see: https://wiki.haskell.org/Cabal/NewBuild

Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: thumbnail-polish-0.0.1.0 (user goal)
[__1] trying: resourcet-1.2.2 (dependency of thumbnail-polish)
[__2] trying: transformers-0.5.5.0/installed-0.5... (dependency of resourcet)
[__3] next goal: friday-devil (dependency of thumbnail-polish)
[__3] rejecting: friday-devil-0.1.1.1, friday-devil-0.1.1.0,
friday-devil-0.1.0.1 (conflict: transformers==0.5.5.0/installed-0.5...,
friday-devil => transformers>=0.3 && <0.5)
[__3] fail (backjumping, conflict set: friday-devil, thumbnail-polish,
transformers)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: resourcet, thumbnail-polish, base,
transformers, friday-devil