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$ cabal build
Preprocessing executable 'hmemo' for hmemo-0.1.0.0...
[1 of 1] Compiling Main ( app/Main.hs, dist/build/hmemo/hmemo-tmp/Main.o )

app/Main.hs:74:32: error:
Ambiguous occurrence ‘<>’
It could refer to either ‘Options.Applicative.<>’,
imported from ‘Options.Applicative’ at app/Main.hs:3:1-26
(and originally defined in ‘Data.Monoid’)
or ‘Data.Semigroup.<>’,
imported from ‘Data.Semigroup’ at app/Main.hs:4:1-21

[and many more instances of the same error]

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 8.0.2