[MacPorts] #55550: Current ntop broken (and fails to rebuild) by current rrdtool

[MacPorts]

#55550: Current ntop broken (and fails to rebuild) by current rrdtool
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  Reporter:  gthb    |      Owner:
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  ntop    |
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Changes (by gthb):

 * Attachment "main.log" added.

 main.log from the failing build

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Ticket URL: <https://trac.macports.org/ticket/55550>
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