[MacPorts] #55469: snowleopard_fixes portgroup behavior changed, causing some ports to fail to build

[MacPorts]

#55469: snowleopard_fixes portgroup behavior changed, causing some ports to fail to
build
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  Reporter:  ryandesign  |      Owner:  kencu
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:              |
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Comment (by kencu):

 Oh, I think I see. I thought the logic would have to be done in a callback
 once the variable was known, but not necessarily so.

 I think I can see how to fix this up.

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Ticket URL: <https://trac.macports.org/ticket/55469#comment:5>
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