[MacPorts] #58322: qt5 portgroup picks incompatible version of qt for Mac OS X 10.6 and earlier

[MacPorts]

#58322: qt5 portgroup picks incompatible version of qt for Mac OS X 10.6 and
earlier
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  Reporter:  ryandesign  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  tiger leopard snowleopard
      Port:  qt5         |
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Comment (by MarcusCalhoun-Lopez):

 I suppose it would be possible for {{{qt5.get_default_name}}} to return an
 invalid Qt version for older systems.\\
 However, that would complicate the later code (e.g. {{{if ${qt5.name} ne
 "" ...}}}).\\
 I would prefer to avoid that if possible.

 Currently, if a user tried to install a port which depends on Qt 5 on an
 older system, the port fails during {{{pre-fetch}}} of qt55-qtbase.\\
 Is there a better place to fail?

-- 
Ticket URL: <https://trac.macports.org/ticket/58322#comment:1>
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