[MacPorts] #33596: gnuplot: update to 4.6.0

[MacPorts]

#33596: gnuplot: update to 4.6.0
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 Reporter:  mojca.miklavec.lists@…          |       Owner:  macports-tickets@…                   
     Type:  update                          |      Status:  new                                  
 Priority:  Normal                          |   Milestone:                                       
Component:  ports                           |     Version:  2.0.4                                
 Keywords:                                  |        Port:  gnuplot                              
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Comment(by mojca.miklavec.lists@…):

 While looking at other options & history more carefully (in particular
 cairo's path:lib/pkgconfig/pango.pc:pango) I realized that it would also
 make sense to replace
 {{{
     depends_lib-append      port:qt4-mac
 }}}
 with something that qt4-mac-devel would satisfy (but not qt3 or qt3-mac).
 This is less important than other patches, but I would be grateful for
 suggestions. I could come up with something like
 {{{
     depends_lib-append      path:lib/pkgconfig/QtCore.pc:qt4-mac
 }}}
 but this is probably not good enough to exclude qt3 and might not work if
 framework option leaves those pc files out.

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Ticket URL: <https://trac.macports.org/ticket/33596#comment:17>
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