https://www.haskell.org/cabal/users-guide/developing-packages.html might help.

On 9 July 2015 at 20:02, Imants Cekusins <imantc@gmail.com> wrote:
How to specify defaultExtensions in cabal (1.22) file?

e.g.
 -fglasgow-exts or
 TypeSynonymInstances

?
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Regards

Sumit Sahrawat