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...
Warning: The following packages are likely to be broken by the reinstalls:
process-1.6.3.0
haskeline-0.7.4.3
ghc-8.6.3
Cabal-2.4.0.1
libiserv-8.6.3
ghci-8.6.3
directory-1.3.3.0
hpc-0.6.0.3
ghc-boot-8.6.3
Continuing even though the plan contains dangerous reinstalls.
Starting     binary-bits-0.5
Starting     cryptohash-sha1-0.11.100.1
Starting     base-orphans-0.8.1
Starting     cryptohash-md5-0.11.100.1
Building     binary-bits-0.5
Building     cryptohash-md5-0.11.100.1
Building     cryptohash-sha1-0.11.100.1
Building     base-orphans-0.8.1
Completed    base-orphans-0.8.1
Starting     dlist-0.8.0.7
Building     dlist-0.8.0.7
Completed    cryptohash-md5-0.11.100.1
Starting     generics-eot-0.4.0.1
Completed    cryptohash-sha1-0.11.100.1
Starting     hashable-1.3.0.0
Building     generics-eot-0.4.0.1
Completed    binary-bits-0.5
Starting     integer-logarithms-1.0.3
Building     hashable-1.3.0.0
Building     integer-logarithms-1.0.3
Completed    dlist-0.8.0.7
Starting     network-info-0.2.0.10
Completed    generics-eot-0.4.0.1
Starting     primitive-0.7.0.0
Building     network-info-0.2.0.10
Completed    integer-logarithms-1.0.3
Starting     tagged-0.8.6
Building     primitive-0.7.0.0
Building     tagged-0.8.6
Completed    hashable-1.3.0.0
Starting     th-abstraction-0.3.1.0
Completed    network-info-0.2.0.10
Starting     time-1.9.3
Building     th-abstraction-0.3.1.0
Completed    tagged-0.8.6
Starting     unordered-containers-0.2.10.0
Building     time-1.9.3
Building     unordered-containers-0.2.10.0
Completed    th-abstraction-0.3.1.0
Starting     async-2.2.2
Building     async-2.2.2
Completed    async-2.2.2
Completed    primitive-0.7.0.0
Starting     scientific-0.3.6.2
Starting     vector-0.12.0.3
Building     scientific-0.3.6.2
Building     vector-0.12.0.3
Completed    unordered-containers-0.2.10.0
Completed    time-1.9.3
Starting     unix-2.7.2.2
Starting     time-compat-1.9.2.2
Building     time-compat-1.9.2.2
Completed    scientific-0.3.6.2
Starting     random-1.1
Building     random-1.1
Completed    time-compat-1.9.2.2
Starting     attoparsec-0.13.2.3
Building     attoparsec-0.13.2.3
Completed    random-1.1
Starting     uuid-types-1.0.3
Building     uuid-types-1.0.3
Building     unix-2.7.2.2
Completed    uuid-types-1.0.3
Completed    attoparsec-0.13.2.3
Completed    vector-0.12.0.3
Completed    unix-2.7.2.2
Starting     postgresql-libpq-0.9.4.2
Starting     entropy-0.4.1.5
Starting     base-compat-0.11.0
Building     base-compat-0.11.0
Building     postgresql-libpq-0.9.4.2
Building     entropy-0.4.1.5
Completed    entropy-0.4.1.5
Starting     uuid-1.3.13
Building     uuid-1.3.13
Completed    base-compat-0.11.0
Starting     aeson-1.4.5.0
Building     aeson-1.4.5.0
Completed    uuid-1.3.13
Completed    postgresql-libpq-0.9.4.2
Completed    aeson-1.4.5.0
Downloading  poseidon-0.1.1.0
Downloaded   poseidon-0.1.1.0
Starting     poseidon-0.1.1.0
Building     poseidon-0.1.1.0
Completed    poseidon-0.1.1.0