[MacPorts] #54797: go-1.4: clang: error: no such file or directory

[MacPorts]

#54797: go-1.4: clang: error: no such file or directory
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  Reporter:  conradwt   |      Owner:  ci42
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.99
Resolution:             |   Keywords:  highsierra
      Port:  go go-1.4  |
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Comment (by sbutler):

 This also fixed my High Sierra issue, and allowed go 1.9.x to build.

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Ticket URL: <https://trac.macports.org/ticket/54797#comment:8>
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