[GHC] #4205: Improve Threading Support for FreeBSD

[GHC]

#4205: Improve Threading Support for FreeBSD
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    Reporter:  pgj               |        Owner:              
        Type:  feature request   |       Status:  patch       
    Priority:  normal            |    Milestone:              
   Component:  Runtime System    |      Version:  6.13        
    Keywords:                    |   Difficulty:              
          Os:  FreeBSD           |     Testcase:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by simonmar):

 We should probably fix that `_DARWIN_C_SOURCE` thing too, it managed to
 slip past me :-)

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4205#comment:4>
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