[haskell-platform] #218: Makefile can't be run with -j4

[haskell-platform]

#218: Makefile can't be run with -j4
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 Reporter:  MtnViewMark             |       Owner:  duncan
     Type:  defect                  |      Status:  new   
 Priority:  major                   |   Milestone:        
Component:  Generic source tarball  |    Keywords:        
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 Because we don't encode the package dependencies into the makefile,
 running -j4 causes havoc - as packages get built in parallel, not in
 order.

 At least we should document this in the README.
 Better would be to have the makefile somehow reject the -j4
 Better still would be for it to actually work!

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Ticket URL: <http://trac.haskell.org/haskell-platform/ticket/218>
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