Just for the record, cabal passes these flags to happy:
    
https://github.com/haskell/cabal/blob/e28abb9ca321b74c82931d23d1e1cc75574ce4b9/Cabal/Distribution/Simple/PreProcess.hs

However, being able to specify custom flags should be possible.

On Tuesday, January 3, 2017 at 9:07:10 AM UTC+1, Pierre van de Laar wrote:
>
> Done: https://github.com/commercialhaskell/stack/issues/2868
>

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