[MacPorts] #59233: postgis2 fails to compile on Mojave with Xcode 11.1

[MacPorts]

#59233: postgis2 fails to compile on Mojave with Xcode 11.1
-------------------------+----------------------
  Reporter:  EJFielding  |      Owner:  Veence
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.1
Resolution:              |   Keywords:
      Port:  postgis2    |
-------------------------+----------------------

Comment (by wyllys66):

 XCode 11.1 only includes the MacOSX10.15.sdk, but port still wants to use
 10.14.  I  worked around this by making a soft link so that configure
 scripts would work correctly.  The other option is to revert to XCode 10.

 $ cd
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs
 $ sudo ln -s MacOSXsdk MacOSX10.14.sdk

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Ticket URL: <https://trac.macports.org/ticket/59233#comment:4>
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