[MacPorts] #59096: postgis2 fails to build with Xcode 11 on 10.14

[MacPorts]

#59096: postgis2  fails to build with Xcode 11 on 10.14
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  Reporter:  rstrauss-logyx  |      Owner:  Veence
      Type:  defect          |     Status:  closed
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.6.0
Resolution:  wontfix         |   Keywords:
      Port:  postgis2        |
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Comment (by jmroot):

 I don't know for postgis2 specifically, but in general you use the CFLAGS
 that are set in the environment.

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Ticket URL: <https://trac.macports.org/ticket/59096#comment:10>
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