[GHC] #2510: Environment modification during installation should be optional

[GHC]

#2510: Environment modification during installation should be optional
------------------------------+---------------------------------------------
  Reporter:  nimnul           |          Owner:                  
      Type:  feature request  |         Status:  new             
  Priority:  normal           |      Milestone:  _|_             
 Component:  None             |        Version:  6.8.3           
Resolution:                   |       Keywords:                  
Difficulty:  Unknown          |             Os:  Windows         
  Testcase:                   |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown     |  
------------------------------+---------------------------------------------
Changes (by igloo):

  * failure:  => None/Unknown
  * milestone:  6.12.1 => _|_

Comment:

 See also #2489

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2510#comment:6>
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