[MacPorts] #64635: qpdf @10.6.0_0+gnutls fail to build on macOS 10.13.6

[MacPorts]

#64635: qpdf @10.6.0_0+gnutls fail to build on macOS 10.13.6
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  Reporter:  nortcele  |      Owner:  Schamschula
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  qpdf      |
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Comment (by jmroot):

 Needs to include cmath/math.h for the floating point flavours of abs().

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Ticket URL: <https://trac.macports.org/ticket/64635#comment:3>
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