[Haskell-beginners] Haskell Platform on OS X, Sierra

[Dennis Raddle]

I have been running the Haskell Platform on OS X El Capitan for a few
months. I just upgraded to Sierra and I notice it broke something. For
instance when I run ghci I get

xcrun: error: invalid active developer path ... missing xcrun ....

What's the best way to recover?  Should I uninstall and reinstall Haskell
Platform?

BTW, how DO you uninstall the Haskell Platform on OS X?
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