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Can not load winpthread.dll

Summary

After a clean install, launching the ghc interpret:

C:\WINDOWS\system32>ghci GHCi, version 8.6.5: http://www.haskell.org/ghc/ :? for help ghc.exe: Could not load `libwinpthread-1.dll'. Reason: addDLL: libwinpthread-1.dll or dependencies not loaded. (Win32 error 1392)

ghc.exe: panic! (the 'impossible' happened) (GHC version 8.6.5 for x86_64-unknown-mingw32): loadArchive "C:\Program Files\Haskell Platform\8.6.5\mingw\x86_64-w64-mingw32\lib\libpthread.dll.a": failed

Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug

The archive is there.

Environment

  • GHC version used: 8.6.5

Optional:

  • Operating System: Windows 10 1903
  • System Architecture: 64bit
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