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...
Starting     fingertree-0.1.4.2
Starting     bytestring-builder-0.10.8.2.0
Starting     base-compat-0.11.0
Building     fingertree-0.1.4.2
Building     bytestring-builder-0.10.8.2.0
Building     base-compat-0.11.0
Completed    bytestring-builder-0.10.8.2.0
Completed    fingertree-0.1.4.2
Completed    base-compat-0.11.0
Downloading  pure-zlib-0.6.7
Downloaded   pure-zlib-0.6.7
Starting     pure-zlib-0.6.7
Building     pure-zlib-0.6.7
Completed    pure-zlib-0.6.7