[GHC] #3896: Make the GHC build system accommodate extra packages

[GHC]

#3896: Make the GHC build system accommodate extra packages
---------------------------------+------------------------------------------
    Reporter:  simonpj           |        Owner:              
        Type:  task              |       Status:  new         
    Priority:  normal            |    Milestone:  6.14 branch 
   Component:  Build System      |      Version:              
    Keywords:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Testcase:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
---------------------------------+------------------------------------------

Comment(by simonpj):

 Related to #3882

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3896#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler