[MacPorts] #50199: gnuplot: opportunistically uses gtk2 when building with wxwidgets enabled

[MacPorts]

#50199: gnuplot: opportunistically uses gtk2 when building with wxwidgets enabled
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  Reporter:  devans@…  |      Owner:  mojca@…
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  gnuplot   |
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Comment (by mojca@…):

 Unless the configure would grep for GTK version in the string `"Default
 config is gtk3-unicode-3.0"`, we would probably need to check for
 {{{
 #ifdef __WXGTK2__
 }}}
 and
 {{{
 #ifdef __WXGTK3__
 }}}
 and test both versions of GTK on "both" OS-es (Mac and Linux).

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Ticket URL: <https://trac.macports.org/ticket/50199#comment:5>
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