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     ribosome-root-0.3.0.0
Building     ribosome-root-0.3.0.0
Failed to install ribosome-root-0.3.0.0
Build log ( /home/builder/.cabal/logs/ghc-8.6.3/ribosome-root-0.3.0.0-BnJcpseNKmM8IPaqpPO0Ai.log ):
cabal: Entering directory '/tmp/cabal-tmp-28536/ribosome-root-0.3.0.0'
Configuring ribosome-root-0.3.0.0...
Building ribosome-root-0.3.0.0...
Warning: No documentation was generated as this package does not contain a
library. Perhaps you want to use the --executables, --tests, --benchmarks or
--foreign-libraries flags.
cabal: No executables and no library found. Nothing to do.

cabal: Leaving directory '/tmp/cabal-tmp-28536/ribosome-root-0.3.0.0'
cabal: Error: some packages failed to install:
ribosome-root-0.3.0.0-BnJcpseNKmM8IPaqpPO0Ai failed during the final install
step. The exception was:
ExitFailure 1