[MacPorts] #57323: libpftputil @0.3 mojave build fails due to unrecognized -syslibroot option to clang

[MacPorts]

#57323: libpftputil @0.3 mojave build fails due to unrecognized -syslibroot option
to clang
--------------------------+--------------------
  Reporter:  rlhamil      |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.5.4
Resolution:               |   Keywords:  mojave
      Port:  libpftputil  |
--------------------------+--------------------

Comment (by rlhamil):

 Yes, @0.4, once it was available via MacPorts, built fine, and then so did
 pftp itself.

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Ticket URL: <https://trac.macports.org/ticket/57323#comment:4>
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