[MacPorts] #38096: Problem with port selfupdate on OS X 10.8.2

[MacPorts]

#38096: Problem with port selfupdate  on OS X 10.8.2
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  Reporter:  xave@…  |      Owner:  macports-tickets@…
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:  2.1.2
Resolution:          |   Keywords:
      Port:          |
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Comment (by raimue@…):

 This means that `/opt/local` is owned by user macports and group id 502,
 although no group exists with that group id. Did you copy the prefix
 around, restore from a backup or anything similar?

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Ticket URL: <https://trac.macports.org/ticket/38096#comment:4>
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