[MacPorts] #28128: 'single' variant for plplot

[MacPorts]

#28128: 'single' variant for plplot
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 Reporter:  drs@…         |       Owner:  takeshi@…           
     Type:  enhancement   |      Status:  new                 
 Priority:  Normal        |   Milestone:                      
Component:  ports         |     Version:  1.9.2               
 Keywords:                |        Port:  plplot              
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Comment(by jmr@…):

 This could now be implemented as a subport if desired.

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Ticket URL: <https://trac.macports.org/ticket/28128#comment:3>
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