Resolving dependencies...
Starting     hashable-1.4.1.0
Building     hashable-1.4.1.0
Completed    hashable-1.4.1.0
Starting     case-insensitive-1.2.1.0
Building     case-insensitive-1.2.1.0
Completed    case-insensitive-1.2.1.0
Downloading  ret-0.1.5.1
Downloaded   ret-0.1.5.1
Starting     ret-0.1.5.1
Building     ret-0.1.5.1
Completed    ret-0.1.5.1
Warning: could not create a symlink in /home/builder/.cabal/bin for ret
because the file exists there already but is not managed by cabal. You can
create a symlink for this executable manually if you wish. The executable file
has been installed at
/home/builder/hackage-server/build-cache/tmp-install/bin/ret