[MacPorts] #61783: grace-5.1.25_3 does not install on darwin_20

[MacPorts]

#61783: grace-5.1.25_3 does not install on darwin_20
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  Reporter:  epaci   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  grace, darwin_20, big sur
      Port:          |
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Comment (by mf2k):

 In the future, please use WikiFormatting, fill in the Port field and add
 the port maintainer(s) to Cc ({{{port info --maintainers grace}}}), if
 any.

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Ticket URL: <https://trac.macports.org/ticket/61783#comment:1>
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