[MacPorts] #54918: libnetpbm: fetch failure (was: ffmpeg @3.3.4 +nonfree fails due to libnetpbm download falure on macOS 10.13, Xcode 9.0)

[MacPorts]

#54918: libnetpbm: fetch failure
------------------------+------------------------
  Reporter:  Dmole      |      Owner:  ryandesign
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.1
Resolution:             |   Keywords:
      Port:  libnetpbm  |
------------------------+------------------------
Changes (by mf2k):

 * owner:   => ryandesign
 * status:  new => assigned
 * port:  ffmpeg => libnetpbm


Comment:

 In the future, please fill in the Port field with the port that actually
 fails to build and Cc that port's maintainers ({{{port info --maintainers
 libnetpbm}}}), if any.

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Ticket URL: <https://trac.macports.org/ticket/54918#comment:1>
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