[MacPorts] #63834: legacy-support: can't read "ls_cache_incpath": no such variable

[MacPorts]

#63834: legacy-support: can't read "ls_cache_incpath": no such variable
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  Reporter:  ryandesign      |      Owner:  cjones051073
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.7.1
Resolution:                  |   Keywords:
      Port:  legacy-support  |
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Comment (by jmroot):

 So yeah, whenever the callback actually does something, it breaks. I would
 guess it's because it's including a portgroup inside a variant, which
 means some things that the portgroup code thinks will be run in a global
 context are actually run in a proc context. There's a reason why PortGroup
 is only supposed to be used at the top of the Portfile.

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Ticket URL: <https://trac.macports.org/ticket/63834#comment:6>
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