[MacPorts] #54504: xorg-server 1.18.4_2: fails to compile on sierra

[MacPorts]

#54504: xorg-server 1.18.4_2: fails to compile on sierra
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  Reporter:  EdHarry      |      Owner:  jeremyhu
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.4.1
Resolution:               |   Keywords:  sierra
      Port:  xorg-server  |
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Comment (by jeremyhu):

 I suspect the version of base that you have isn’t picking 4.0.  This will
 be addressed whenever a newer version of base is released, but I’m also
 cleaning up the list to not include these toolchains on newer macOS
 versions.

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Ticket URL: <https://trac.macports.org/ticket/54504#comment:10>
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