[MacPorts] #57263: clang-6.0 does not build on Mojave

[MacPorts]

#57263: clang-6.0 does not build on Mojave
----------------------+-----------------------------------------
 Reporter:  eesatfan  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.5.4
 Keywords:            |       Port:  clang-6.0 dependency of qt5
----------------------+-----------------------------------------
 Error: Failed to build clang-6.0: command execution failed
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_llvm-6.0/clang-6.0/main.log
 for details.
 Error: Follow https://guide.macports.org/#project.tickets to report a bug.
 Error: Processing of port qt5 failed

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Ticket URL: <https://trac.macports.org/ticket/57263>
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