[MacPorts] #55813: clhep: fails to build on legacy systems

[MacPorts]

#55813: clhep: fails to build on legacy systems
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  Reporter:  mojca   |      Owner:  mojca
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  clhep   |
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Comment (by kencu):

 only if compiler is clang...

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Ticket URL: <https://trac.macports.org/ticket/55813#comment:2>
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