[haskell-platform] #109: Detect preinstalled binaries

[haskell-platform]

#109: Detect preinstalled binaries
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 Reporter:  dons                    |       Owner:  duncan  
     Type:  defect                  |      Status:  new     
 Priority:  major                   |   Milestone:  Blue Sky
Component:  Generic source tarball  |    Keywords:          
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 We don't currently check in the unix tarball whether alex, happy, cabal-
 install etc. are installed and up to date.

 We could do that check and avoid additional work.

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Ticket URL: <http://trac.haskell.org/haskell-platform/ticket/109>
haskell-platform <http://trac.haskell.org/haskell-platform>
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