SlackBuildsOrg/haskell/haskell-auto-update

A common problem is the desire to have an action run at a scheduled
interval, but only if it is needed. This library allows you to define
actions which will either be performed by a dedicated thread or,
in times of low volume, will be executed by the calling thread.

After uninstalling, run this command to unregister the package from
the ghc package database:   ghc-pkg recache