[MacPorts] #53169: PortIndex contains expanded prefix

[MacPorts]

#53169: PortIndex contains expanded prefix
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  Reporter:  jmroot  |      Owner:
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:  2.3.5
Resolution:          |   Keywords:
      Port:          |
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Comment (by neverpanic):

 Yep, that was probably me in [0e21180e3d1b197d077fde37a394ef67d8e486d1
 /macports-base], since I didn't understand the purpose of `set prefix
 {\${prefix}}` and it didn't have a comment explaining it.

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Ticket URL: <https://trac.macports.org/ticket/53169#comment:2>
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