[MacPorts] #63348: port @2.7.1 cleans when upgrading although asked via -sk not to do so

[MacPorts]

#63348: port @2.7.1 cleans when upgrading although asked via -sk not to do so
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  Reporter:  ballapete  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:  2.7.1
Resolution:             |   Keywords:
      Port:             |
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Comment (by ballapete):

 `port -vd build -sk imlib2` worked fine – so it's presumingly a side-
 effect or normal action that no cleaning follows the build action. `port
 -vdsk upgrade  imlib2` works indeed as intended. Thank you!

 Problem solved.

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Ticket URL: <https://trac.macports.org/ticket/63348#comment:3>
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