[MacPorts] #68874: cmake portgroup: can't read "cmake._archflag_vars": no such variable

[MacPorts]

#68874: cmake portgroup: can't read "cmake._archflag_vars": no such variable
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  Reporter:  ryandesign  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  cmake       |
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Comment (by jmroot):

 The PortGroup mechanism was designed to be used at the top of a Portfile,
 not in a variant. This is one of the things that happens if you don't do
 that (because variants create a proc).

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Ticket URL: <https://trac.macports.org/ticket/68874#comment:2>
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