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How do I install yi?
get it from hackage. Configure, compile and install yi as you would do for any other Cabal package.
Setup.hs does not compile!
You need to use Cabal version 1.2.3. To make sure you use it, do:
   ghc -package Cabal- --make Setup.hs
   ./Setup configure ...
Setup configure fails with
"Setup.hs: Package yi-0.3 can't be built on this system."
it means that you have no UI package available. You need vty or gtk2hs installed. Get them from hackage.