[MacPorts] #59190: graphviz @2.40.1_2+pangocairo+x11: not a C compiler: should compile 'int i = 1; ' (was: graphviz @2.40.1_2 +pangocairo+x11: Failed to build graphviz: command execution failed)

[MacPorts]

#59190: graphviz @2.40.1_2+pangocairo+x11: not a C compiler: should compile 'int i
= 1;'
-----------------------+------------------------
  Reporter:  allgoth   |      Owner:  ryandesign
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.1
Resolution:            |   Keywords:
      Port:  graphviz  |
-----------------------+------------------------

Comment (by ryandesign):

 I'm still not sure what the `not a C compiler: should compile 'int i =
 1;'` error is about. Apparently something called "iffe" is trying to use
 the C compiler to compile a simple program and it is failing, but I don't
 know what "iffe" is and the log doesn't seem to be showing us what error
 message the C compiler emitted, so I don't know how to diagnose this. I
 don't think anyone else is experiencing this.

 You might try reinstalling a version of Xcode compatible with your macOS
 version and the matching version of the command line tools to ensure that
 you have a working compiler.

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Ticket URL: <https://trac.macports.org/ticket/59190#comment:4>
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