[MacPorts] #55024: ghc @7.8.3_6 build error: openBinaryFile: does not exist

[MacPorts]

#55024: ghc @7.8.3_6 build error: openBinaryFile: does not exist
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  Reporter:  1-61803  |      Owner:  neverpanic
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  ghc      |
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Comment (by kencu):

 It's a weird thing that happens when building big projects like compilers.
 With the right combination of processors, number of cores, amount and
 speed of memory, and type of disc, some required parts are not finished
 when another thread needs them, so it errors out with weird errors.

 I saw this occasionally at times while fixing ghc for various systems,
 never reproducibly. We could just set `use_parallel_build no` permanently
 to solve issues like yours - but then the 99% of people who don't see this
 error would take hours longer to build it.

 I guess I'd set it in the portfile to minimize headaches, and let the
 buildbots build it for most everyone, but we'll leave it to the macports
 admins to decide.

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Ticket URL: <https://trac.macports.org/ticket/55024#comment:7>
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