[MacPorts] #62288: openscad-devel @2018.04-1_2: error: no viable conversion from 'boost::tribool' to 'bool'

[MacPorts]

#62288: openscad-devel @2018.04-1_2: error: no viable conversion from
'boost::tribool' to 'bool'
-----------------------------+----------------------
  Reporter:  murrayE         |      Owner:  dstrubbe
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.6.99
Resolution:                  |   Keywords:
      Port:  openscad-devel  |
-----------------------------+----------------------

Comment (by LenoreHorner):

 The increment to openscad-devel @2018.04-1_3 has multiple errors on Big
 Sur with Xcode 12.5.1.  Version 2021.01 exists on openscad website.  Not
 having ever built a port before, I don't think I'm qualified to test
 whether switching to the newer version fixes these errors or not.  (And
 newest version seems still not to be M1 compatible.)  I've attached the
 log in case it's helpful to someone.

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Ticket URL: <https://trac.macports.org/ticket/62288#comment:2>
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