[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 1-61803):

 Replying to [comment:7 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.

 Thanks, Ken. It actually only happened when going from `7.8.3_5` to
 `7.8.3_6`.[[BR]]
 I'll keep the port locally set to `use_parallel_build no` for the time
 being.

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Ticket URL: <https://trac.macports.org/ticket/55024#comment:8>
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