[GHC] #2791: Allow two versions of GHC to be installed simultaneously with the OS X installer

[GHC]

#2791: Allow two versions of GHC to be installed simultaneously with the OS X
installer
---------------------------------+------------------------------------------
    Reporter:  igloo             |        Owner:                  
        Type:  bug               |       Status:  new             
    Priority:  normal            |    Milestone:  6.12 branch     
   Component:  Build System      |      Version:  6.8.3           
    Severity:  normal            |   Resolution:                  
    Keywords:                    |   Difficulty:  Unknown         
    Testcase:                    |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |  
---------------------------------+------------------------------------------
Changes (by igloo):

  * milestone:  6.10 branch => 6.12 branch

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2791#comment:1>
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