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: ats-pkg-3.5.0.0 (user goal)
[__1] next goal: libarchive (dependency of ats-pkg)
[__1] rejecting: libarchive-2.2.1.0 (conflict: pkg-config package
libarchive(==3.4.0 || >3.4.0) && <4.0, not found in the pkg-config database)
[__1] rejecting: libarchive-2.2.0.2, libarchive-2.2.0.1, libarchive-2.2.0.0,
libarchive-2.1.3.2, libarchive-2.1.3.1, libarchive-2.1.2.1,
libarchive-1.0.3.0, libarchive-1.0.2.0, libarchive-1.0.1.0,
libarchive-1.0.0.0, libarchive-0.2.1.2, libarchive-0.2.1.1,
libarchive-2.1.3.0, libarchive-2.1.2.0, libarchive-2.1.1.0,
libarchive-2.1.0.1, libarchive-2.1.0.0, libarchive-2.0.0.2,
libarchive-2.0.0.1, libarchive-2.0.0.0, libarchive-1.0.5.1,
libarchive-1.0.5.0, libarchive-1.0.4.0, libarchive-0.2.1.0,
libarchive-0.2.0.0, libarchive-0.1.0.0 (conflict: ats-pkg =>
libarchive>=2.2.1.0)
[__1] fail (backjumping, conflict set: ats-pkg, libarchive)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: ats-pkg, libarchive