[MacPorts] #64635: qpdf @10.6.0_0+gnutls fail to build on macOS 10.3.6

[MacPorts]

#64635: qpdf @10.6.0_0+gnutls fail to build on macOS 10.3.6
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  Reporter:  nortcele  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  qpdf      |
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Comment (by nortcele):

 No problem on macOS 10.9.5, 10.10.5, 10.11.6.

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Ticket URL: <https://trac.macports.org/ticket/64635#comment:1>
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