[MacPorts] #59235: MacVim fails to build on macOS 10.15 Catalina

[MacPorts]

#59235: MacVim fails to build on macOS 10.15 Catalina
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  Reporter:  moyang  |      Owner:  raimue
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.1
Resolution:          |   Keywords:
      Port:  MacVim  |
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Comment (by rieder):

 Likewise, for me also `port clean macvim` before `port install macvim`
 doesn't help at all.

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Ticket URL: <https://trac.macports.org/ticket/59235#comment:8>
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