[MacPorts] #59206: Poppler won't build after Xcode update

[MacPorts]

#59206: Poppler won't build after Xcode update
------------------------+-------------------------
 Reporter:  boatmorrow  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.1
 Keywords:              |       Port:  Popper-0.81
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 Hello,

 Poppler-0.81 won't build after my latest Xcode update and attempt to
 upgrade outdated ports.  This ticket is close to ticket #57166.  I am
 getting a failure on:

 :info:build clang: warning: no such sysroot directory:
 '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk'
 [-W missing-sysroot]

 The last ticket was resolved by performing a full Migration.  Which is
 what I did, but Poppler still won't build.

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Ticket URL: <https://trac.macports.org/ticket/59206>
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