[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
--------------------------+------------------------
  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 jmroot):

 The only ways I can think of are if your [https://github.com/macports
 /macports-base/blob/v2.9.2/src/port1.0/portmain.tcl#L127 portmain.tcl] has
 been modified or if the variables are being overridden on the command line
 or in a conf file.

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Ticket URL: <https://trac.macports.org/ticket/69650#comment:9>
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