[Hackage] #376: Allow constraint on using installed package versions

[Hackage]

#376: Allow constraint on using installed package versions
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  Reporter:  duncan              |        Owner:                   
      Type:  enhancement         |       Status:  new              
  Priority:  normal              |    Milestone:  cabal-install-0.8
 Component:  cabal-install tool  |      Version:  HEAD             
  Severity:  normal              |     Keywords:                   
Difficulty:  normal              |   Ghcversion:  6.8.3            
  Platform:                      |  
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Comment(by elga):

 * [http://www.releve-identite-operateur.fr/rio-simyo.html simyo]

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Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/376#comment:7>
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Hackage: Cabal and related projects