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     primitive-0.7.0.0
Building     primitive-0.7.0.0
Completed    primitive-0.7.0.0
Starting     vector-0.12.1.2
Building     vector-0.12.1.2
Completed    vector-0.12.1.2
Downloading  apecs-0.9.1
Downloaded   apecs-0.9.1
Starting     apecs-0.9.1
Building     apecs-0.9.1
Completed    apecs-0.9.1