[MacPorts] #27893: add pangocairo variant for gnuplot

[MacPorts]

#27893: add pangocairo variant for gnuplot
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 Reporter:  ejtttje@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement        |      Status:  new                                  
 Priority:  Normal             |   Milestone:                                       
Component:  ports              |     Version:  1.9.2                                
 Keywords:                     |        Port:  gnuplot                              
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Comment(by jpo@…):

 +1 to include the cairo dependency in the port (and not as a variant)

 <pdf biased>
 If you have to run gnuplot in heterogeneous systems, and in particular
 macosx and linux ones, this makes a lot of sense as most common linux
 distros don't have pdflib-lite in their main repos due to licensing
 problems.  This meant that the gnuplot packages avaialble in their main
 repos didn't supported the pdf terminal. But more recently, gnuplot 4.4 is
 able to  offer a pdf terminal via the cairo library (pdfcairo), which
 enables more recent linux distros (e.g. Fedora 14) to ship a gnuplot with
 a pdf terminal built-in.
 </pdf biased>

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Ticket URL: <https://trac.macports.org/ticket/27893#comment:3>
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