[MacPorts] #59150: libiconv-bootstrap: fails to build with clang on 10.6

[MacPorts]

#59150: libiconv-bootstrap: fails to build with clang on 10.6
---------------------------------+------------------------
  Reporter:  mojca               |      Owner:  ryandesign
      Type:  defect              |     Status:  closed
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:
Resolution:  fixed               |   Keywords:
      Port:  libiconv-bootstrap  |
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Comment (by kencu):

 I thought we made our basic assumption that users had the right Xcode
 installed for every os.version as a baseline.

 I therefore wasn't planning on putting tests like this to see if they have
 not got the recommended Xcode installed  in any Portfiles myself, but of
 course, this one is yours.

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Ticket URL: <https://trac.macports.org/ticket/59150#comment:6>
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