[MacPorts] #61306: ghostscript @ 9.52_0+x11 fails to build with xcode 12: error: implicit declaration of function 'FF_free' is invalid in C99

[MacPorts]

#61306: ghostscript @ 9.52_0+x11 fails to build with xcode 12: error: implicit
declaration of function 'FF_free' is invalid in C99
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  Reporter:  usrluciano   |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.6.3
Resolution:               |   Keywords:
      Port:  ghostscript  |
--------------------------+--------------------

Comment (by bK4gYuRo):

 Errors look identical regardless of Xcode version. I could be wrong, but
 it seems there must be some other reason for the failure than xcode12.
 Builds on the buildbot farm were successful in July, and I successfully
 upgraded ghostscript on two other 10.13.6 systems previously. It just
 broke today.

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Ticket URL: <https://trac.macports.org/ticket/61306#comment:8>
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