[MacPorts] #60454: Print a warning when users specify version/revision information at install time that will not be honored

[MacPorts]

#60454: Print a warning when users specify version/revision information at install
time that will not be honored
--------------------------+--------------------
  Reporter:  ryandesign   |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.6.2
Resolution:               |   Keywords:
      Port:               |
--------------------------+--------------------

Comment (by kurthindenburg):

 If you want to only note if the provided @version is different then the
 current port's version, I haven't determine how to do that and not sure if
 it is possible.

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Ticket URL: <https://trac.macports.org/ticket/60454#comment:2>
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