[MacPorts] #69653: mkvtoolnix-legacy: support Qt4 where Qt5 unavailable

[MacPorts]

#69653: mkvtoolnix-legacy: support Qt4 where Qt5 unavailable
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  Reporter:  barracuda156       |      Owner:  (none)
      Type:  defect             |     Status:  new
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:  2.9.2
Resolution:                     |   Keywords:  snowleopard, leopard, tiger
      Port:  mkvtoolnix-legacy  |
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Comment (by barracuda156):

 Replying to [comment:3 i0ntempest]:
 > Replying to [comment:2 barracuda156]:
 > >
 > > Ok, if no Qt4 support existed, then perhaps just disable qtgui for
 systems where it cannot be supported? And include qt5 PG conditionally.
 > Building (at least for v81) requires qt regardless if qt gui is enabled
 or not.

 Ok, got it. Then we just need to move fallback version from `mkvtoolnix`
 port to here, that will solve the problem.

 > > P. S. By the way, what is the point of having a separate port, when
 existing one supports older systems with fallbacks already?
 https://github.com/macports/macports-
 ports/blob/d2f9f6bb49a41d643b1c975e2bcfd6805e0ca2d5/multimedia/mkvtoolnix/Portfile
 > Because soon it will not. See https://trac.macports.org/ticket/69030.
 Submitting a legacy port is part of the preparation to update the main
 port to v83 which is qt6 only.

 Thank you for explanation, I did not see that ticket.

 P. S. It’s a shame that it requires Qt5 even without GUI, and does not
 have GTK option…

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Ticket URL: <https://trac.macports.org/ticket/69653#comment:4>
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