[Nix-dev] A Journey into our brand-new Haskell infrastructure: Part II

Peter Simons simons at cryp.to
Mon Jan 12 01:23:41 CET 2015

Hi Thomas,

 > How would I get older versions of certain packages (e.g. I need
 > optparse-applicative 0.10 for elm-make) into hackage-packages.nix?

by adding "optparse-applicative == 0.10.*" to the 'extraPackages' list at
This would include 'optparse-applicative_0_10_0' in hackage-packages.nix
the next time it's re-generated.

Best regards,

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