[MacPorts] #54151: qjackctl @0.45+qt4: variant +qt4 fails to build on Sierra

[MacPorts]

#54151: qjackctl @0.45+qt4: variant +qt4 fails to build on Sierra
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  Reporter:  detlevd   |      Owner:
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.4.1
Resolution:            |   Keywords:
      Port:  qjackctl  |
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Comment (by kencu):

 we could put something like the following in the qt4 block

 `require_active_variants qt4-mac universal`

 I haven't used that `require_active_variants` portgroup before, but if I'm
 correct, that would ensure qt4-mac is installed in a compatible format.
 Although it takes time to build it, we'd be doing everyone a favour in the
 end, I think, by fixing this qt4 error in whatever other ports might have
 it.

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Ticket URL: <https://trac.macports.org/ticket/54151#comment:5>
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