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] next goal: gi-atk (user goal)
[__0] rejecting: gi-atk-2.0.18 (conflict: pkg-config package atk>=2.0 && <3,
not found in the pkg-config database)
[__0] rejecting: gi-atk-2.0.17, gi-atk-2.0.15, gi-atk-2.0.14, gi-atk-2.0.13,
gi-atk-2.0.12, gi-atk-2.0.11, gi-atk-2.0.10, gi-atk-2.0.9, gi-atk-2.0.8,
gi-atk-2.0.7, gi-atk-2.0.6, gi-atk-2.0.5, gi-atk-2.0.4, gi-atk-2.0.3,
gi-atk-2.0.2, gi-atk-2.0.1, gi-atk-0.2.18.15, gi-atk-0.2.18.14,
gi-atk-0.2.18.13, gi-atk-0.2.18.12, gi-atk-0.2.18.10, gi-atk-0.2.16.12,
gi-atk-0.2.16.11, gi-atk-0.2.16.10, gi-atk-0.2.16.9, gi-atk-0.2.16.8
(constraint from user target requires ==2.0.18)
[__0] fail (backjumping, conflict set: gi-atk)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: gi-atk