[MacPorts] #65905: pango @1.50.7: error: use of undeclared identifier 'FC_VARIABLE'

[MacPorts]

#65905: pango @1.50.7: error: use of undeclared identifier 'FC_VARIABLE'
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  Reporter:  jamesstuartgunning  |      Owner:  ryandesign
      Type:  defect              |     Status:  assigned
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:  2.7.2
Resolution:                      |   Keywords:  bigsur
      Port:  pango               |
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Comment (by jamesstuartgunning):

 Thanks Ryan. Not sure if /opt/X11 is the problem: for instance if I move
 it aside (rename it), the build still breaks. Any suggestions welcome..

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Ticket URL: <https://trac.macports.org/ticket/65905#comment:10>
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