[MacPorts] #61252: thrift +glib2 error: implicit declaration of function 'thrift_protocol_decorator_write_message_begin' is invalid in C99

[MacPorts]

#61252: thrift +glib2 error: implicit declaration of function
'thrift_protocol_decorator_write_message_begin' is invalid in C99
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  Reporter:  ve3m    |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  thrift  |
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Comment (by ryandesign):

 Implicit function declaration errors are new in Xcode 12. If you want to
 avoid this problem while we figure out how to fix it, downgrade to Xcode
 11 and/or the Xcode 11 version of the command line tools.

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Ticket URL: <https://trac.macports.org/ticket/61252#comment:6>
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