[MacPorts] #71306: gmt5 fails to configure upon latest revbump

[MacPorts]

#71306: gmt5 fails to configure upon latest revbump
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  Reporter:  barracuda156  |      Owner:  remkos
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.10.4
Resolution:                |   Keywords:
      Port:  gmt5          |
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Comment (by remkos):

 As one of the GMT developers, I suggest that gmt5 can be dropped from
 Macports, since we no longer maintain GMT5 anymore in any case. Users
 should make the transition to gmt6.
 At least start to mark it as deprecated.

 Furthermore, I would then suggest to remove gmt6 from science/gmt5 and
 create a new science/gmt6.

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Ticket URL: <https://trac.macports.org/ticket/71306#comment:4>
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