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: Chart-gtk3-1.9.3 (user goal)
[__1] next goal: gtk3 (dependency of Chart-gtk3)
[__1] rejecting: gtk3-0.15.4, gtk3-0.15.3, gtk3-0.15.1, gtk3-0.15.0,
gtk3-0.14.8, gtk3-0.14.7, gtk3-0.14.6, gtk3-0.14.5, gtk3-0.14.4, gtk3-0.14.3,
gtk3-0.14.2, gtk3-0.14.1, gtk3-0.14.0 (conflict: pkg-config package
gtk+-3.0-any, not found in the pkg-config database)
[__1] rejecting: gtk3-0.13.9, gtk3-0.13.8, gtk3-0.13.7, gtk3-0.13.6,
gtk3-0.13.4, gtk3-0.13.3, gtk3-0.13.2, gtk3-0.13.1, gtk3-0.13.0.3,
gtk3-0.13.0.2, gtk3-0.13.0.1, gtk3-0.13.0.0, gtk3-0.12.5.7, gtk3-0.12.5.6,
gtk3-0.12.5.5, gtk3-0.12.5.4, gtk3-0.12.5.3, gtk3-0.12.5.2, gtk3-0.12.5.1,
gtk3-0.12.5.0 (conflict: Chart-gtk3 => gtk3>=0.14)
[__1] rejecting: gtk3-0.14.9 (conflict: pkg-config package gtk+-3.0-any, not
found in the pkg-config database)
[__1] fail (backjumping, conflict set: Chart-gtk3, gtk3)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: gtk3, Chart-gtk3