[MacPorts] #55024: ghc @7.8.3_6 fails to build

[MacPorts]

#55024: ghc @7.8.3_6 fails to build
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  Reporter:  1-61803  |      Owner:
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  ghc      |
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Comment (by kencu):

 might be a race condition on your machine. It built on all the buildbots,
 and builds for me locally.

 What happens if you just retry the build without cleaning?

 And if that doesn't work, try adding `use_parallel_build  no` to the
 portfile, clean and reinstall and see if that fixes it.

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Ticket URL: <https://trac.macports.org/ticket/55024#comment:1>
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