[MacPorts] #56201: make dist requires DISTVER to be specified

[MacPorts]

#56201: make dist requires DISTVER to be specified
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  Reporter:  ryandesign   |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.4.99
Resolution:               |   Keywords:
      Port:               |
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Comment (by raimue):

 You can run this command from any branch as it is not tied to the branch
 you have checked out. As we have never merged changes to the release
 process to release branches, I would expect to always run this command
 from `master`.

 Maybe this should not be a target in this Makefile and it should be moved
 to a standalone script instead, for example in `portmgr/` next to
 `ReleaseProcess.md`, or even to another repository.

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Ticket URL: <https://trac.macports.org/ticket/56201#comment:1>
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