[Hackage] #224: allow specifying package version constraints to configure

[Hackage]

#224: allow specifying package version constraints to configure
----------------------------+-----------------------------------------------
  Reporter:  duncan         |        Owner:           
      Type:  enhancement    |       Status:  new      
  Priority:  normal         |    Milestone:  Cabal-1.4
 Component:  Cabal library  |      Version:  1.2.3.0  
  Severity:  normal         |   Resolution:           
  Keywords:                 |   Difficulty:  normal   
Ghcversion:  6.8.2          |     Platform:           
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Comment (by igloo):

 The flag is doing the same job as the `build-depends` field, so `--build-
 depends="bytestring == 0.9.0.1"` makes sense to me.

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Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/224#comment:1>
Hackage <http://haskell.org/cabal/>
Hackage: Cabal and related projects