[MacPorts] #31011: new gmt ports for versions 4 and 5

[MacPorts]

#31011: new gmt ports for versions 4 and 5
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 Reporter:  florian@…          |       Owner:  macports-tickets@…                   
     Type:  update             |      Status:  new                                  
 Priority:  Normal             |   Milestone:                                       
Component:  ports              |     Version:  2.0.1                                
 Keywords:  haspatch           |        Port:  gmt                                  
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 GMT5 introduces a new API which forces some users to keep a parallel GMT4
 installation for compatibility reasons. I would introduce two new ports
 gmt4 and gmt5 (Portfiles attached) that do not conflict with each others.
 The old gmt port should be replaced by gmt4 (Portfile patch attached). I
 would also be willing to maintain these ports in the future.

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Ticket URL: <https://trac.macports.org/ticket/31011>
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