[MacPorts] #62236: plantuml @1.2020.11 fails to build on Big Sur

[MacPorts]

#62236: plantuml @1.2020.11 fails to build on Big Sur
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  Reporter:  cctile               |      Owner:  (none)
      Type:  defect               |     Status:  new
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:  2.6.4
Resolution:                       |   Keywords:  bigsur
      Port:  plantuml apache-ant  |
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Comment (by jmroot):

 Interestingly, this succeeded on the buildbot:
 https://build.macports.org/builders/ports-
 11_x86_64-builder/builds/20211/steps/install-port/logs/stdio

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Ticket URL: <https://trac.macports.org/ticket/62236#comment:3>
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