[MacPorts] #62726: openbox-3.5.0_0.darwin_20.x86_64: Build failure on Big Sur

[MacPorts]

#62726: openbox-3.5.0_0.darwin_20.x86_64: Build failure on Big Sur
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  Reporter:  schulzs  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.6.4
Resolution:           |   Keywords:
      Port:  openbox  |
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Changes (by schulzs):

 * Attachment "main.log" added.

 Log of the build attempt

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Ticket URL: <https://trac.macports.org/ticket/62726>
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