[MacPorts] #63467: opencv4: Add a universal variant

[MacPorts]

#63467: opencv4: Add a universal variant
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  Reporter:  MarkCallow   |      Owner:  stromnov
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  opencv4      |
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Comment (by MarkCallow):

 Thanks for the suggestion @kencu. I did that and gmake was successfully
 installed but when I try `sudo port install opencv4 +universal` again,
 `port` still tries to build gmake and it fails with the same error I
 described.

 It makes sense that what you say should work since gmake is, presumably,
 just needed for building `opencv4` so no need for a universal variant of
 it. This is the second time where I am getting a different result from you
 in this regard. Is there perhaps some MacPorts config setting that I need
 to change? Note that I do NOT have +universal set in
 `/opt/local/etc/macports/variants.conf`.

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Ticket URL: <https://trac.macports.org/ticket/63467#comment:6>
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