[MacPorts] #58108: JDK missing in Mojave images?

[MacPorts]

#58108: JDK missing in Mojave images?
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  Reporter:  mattbishop     |      Owner:  admin@…
      Type:  enhancement    |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  buildbot/mpbb  |    Version:
Resolution:                 |   Keywords:
      Port:                 |
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Comment (by mf2k):

 The py-tensorflow Portfile is a better example because it shows how to set
 the minimum version of java required with a fallback openjdk requirement.

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Ticket URL: <https://trac.macports.org/ticket/58108#comment:10>
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