[Hackage] #671: better error message for broken build tools

[Hackage]

#671: better error message for broken build tools
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  Reporter:  duncan           |        Owner:         
      Type:  defect           |       Status:  new    
  Priority:  normal           |    Milestone:         
 Component:  Cabal library    |      Version:  1.8.0.4
  Severity:  normal           |     Keywords:         
Difficulty:  easy (<4 hours)  |   Ghcversion:         
  Platform:                   |  
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Comment(by elga):

 * [http://www.releve-identite-operateur.fr/numbero-de-virgin-mobile.html
 virgin mobile]

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Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/671#comment:1>
Hackage <http://haskell.org/cabal/>
Hackage: Cabal and related projects