[MacPorts] #54571: libomp @4.0.1 does not build on a system running OS X 10.12.6

[MacPorts]

#54571: libomp @4.0.1 does not build on a system running OS X 10.12.6
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  Reporter:  josephsacco  |      Owner:
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.4.1
Resolution:               |   Keywords:  libomp OSX Sierra
      Port:  libomp       |
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Changes (by josephsacco):

 * Attachment "Portfile.diff" added.

 Portfile diff

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Ticket URL: <https://trac.macports.org/ticket/54571>
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