Requires linking against the threaded runtime error

Consider the following error message:

CallStack (from HasCallStack):
  error, called at libraries/base/GHC/Event/Thread.hs:290:13 in base:GHC.Event.Thread
GHC.Event.Thread.getSystemTimerManager: the TimerManager requires linking against the threaded runtime

If you see this, you are trying to execute code which requires the application to have been built with the -threaded flag. You can fix this in cabal by changing the options passed to GHC. For example:

common warnings
-  ghc-options: -Werror -Wall
+  ghc-options: -Werror -Wall -threaded

content

Requires linking against the threaded runtime error

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