making Happy-1.17

[Mitchell, Neil]

Hi Serge,

> It reports
>   Configuring happy-1.17...
>   Setup.lhs: At least the following dependencies are missing:
>       mtl >=1.0

First make mtl, which is avaiable here:

http://hackage.haskell.org/cgi-bin/hackage-scripts/package/mtl

Thanks

Neil

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