[MacPorts] #57830: graphviz-gui fails to build on Mojave (CompileXIB)

[MacPorts]

#57830: graphviz-gui fails to build on Mojave (CompileXIB)
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  Reporter:  thomasleaute  |      Owner:  ryandesign
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.5.4
Resolution:                |   Keywords:
      Port:  graphviz-gui  |
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Comment (by kencu):

 Looks like the error might be this:
 {{{
 error: Compiling for earlier than macOS 10.6 is no longer supported.
 }}}
 so have to see why it's trying to do that.

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Ticket URL: <https://trac.macports.org/ticket/57830#comment:3>
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