[MacPorts] #72024: asymptote @2.96 fails to build: ModuleNotFoundError: No module named 'PyQt5'

[MacPorts]

#72024: asymptote @2.96 fails to build: ModuleNotFoundError: No module named
'PyQt5'
---------------------------+--------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.10.5
Resolution:                |   Keywords:
      Port:  asymptote     |
---------------------------+--------------------

Comment (by barracuda156):

 Looks like upstream has broken building with external GC, so the build
 tries to set `GCLIB='$(GC)/.libs/libgc.a'`.

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Ticket URL: <https://trac.macports.org/ticket/72024#comment:3>
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