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     base64-bytestring-1.0.0.2
Starting     entropy-0.4.1.5
Starting     bytestring-builder-0.10.8.2.0
Starting     SHA-1.6.4.4
Building     base64-bytestring-1.0.0.2
Building     bytestring-builder-0.10.8.2.0
Building     SHA-1.6.4.4
Completed    bytestring-builder-0.10.8.2.0
Starting     hashable-1.3.0.0
Building     hashable-1.3.0.0
Building     entropy-0.4.1.5
Completed    base64-bytestring-1.0.0.2
Starting     integer-logarithms-1.0.3
Building     integer-logarithms-1.0.3
Completed    hashable-1.3.0.0
Starting     network-3.0.1.1
Completed    entropy-0.4.1.5
Starting     primitive-0.7.0.0
Completed    integer-logarithms-1.0.3
Starting     random-1.1
Building     primitive-0.7.0.0
Building     random-1.1
Completed    SHA-1.6.4.4
Starting     zlib-0.6.2.1
Building     network-3.0.1.1
Building     zlib-0.6.2.1
Completed    random-1.1
Starting     case-insensitive-1.2.1.0
Building     case-insensitive-1.2.1.0
Completed    case-insensitive-1.2.1.0
Starting     async-2.2.2
Building     async-2.2.2
Completed    zlib-0.6.2.1
Completed    async-2.2.2
Completed    network-3.0.1.1
Starting     streaming-commons-0.2.1.1
Building     streaming-commons-0.2.1.1
Completed    primitive-0.7.0.0
Starting     scientific-0.3.6.2
Building     scientific-0.3.6.2
Completed    scientific-0.3.6.2
Starting     attoparsec-0.13.2.3
Building     attoparsec-0.13.2.3
Completed    streaming-commons-0.2.1.1
Completed    attoparsec-0.13.2.3
Downloading  websockets-0.12.6.0
Downloaded   websockets-0.12.6.0
Starting     websockets-0.12.6.0
Building     websockets-0.12.6.0
Completed    websockets-0.12.6.0