[MacPorts] #39782: Add keyword to list compatible graphical environments (X11, Quartz, Wayland)?

[MacPorts]

#39782: Add keyword to list compatible graphical environments (X11, Quartz,
Wayland)?
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  Reporter:  c.herbig@…   |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by c.herbig@…):

 Replying to [comment:4 larryv@…]:
 > The variants should not do nothing. They should check for the presence
 or absence of the relevant dependencies’ variants, as I described above.
 The Inkscape port seems to do just that:
 {{{
 variant x11 conflicts quartz {}
 variant quartz conflicts x11 {}

 if {![variant_isset quartz]} {
     default_variants +x11
 }
 }}}

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Ticket URL: <https://trac.macports.org/ticket/39782#comment:8>
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