[MacPorts] #57531: root6: error: use of undeclared identifier 'CLOCK_REALTIME'

[MacPorts]

#57531: root6: error: use of undeclared identifier 'CLOCK_REALTIME'
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  Reporter:  ryandesign  |      Owner:  cjones051073
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  root6       |
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Comment (by cjones051073):

 The developers already know (its coming from xrootd).

 xrootd already uses the legacy PortGroup. I did not realise though ports
 building against xrootd would also need it. I've already pushed the fix.

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Ticket URL: <https://trac.macports.org/ticket/57531#comment:1>
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