[MacPorts] #69650: netpbm fails to destroot Port when not using MacPorts as root

[MacPorts]

#69650: netpbm fails to destroot Port when not using MacPorts as root
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  Reporter:  tux-o-matic  |      Owner:  ryandesign
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  netpbm       |
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Comment (by ryandesign):

 Which conf files would allow such a setting? I tried setting
 `install_user` or `install.user` in macports.conf and it was not honored.

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Ticket URL: <https://trac.macports.org/ticket/69650#comment:10>
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