[MacPorts] #53931: clang's ld doesn't recognise "-lto_library" flag on 10.6

[MacPorts]

#53931: clang's ld doesn't recognise "-lto_library" flag on 10.6
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  Reporter:  mojca                               |      Owner:  jeremyhu
      Type:  defect                              |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:  snowleopard
      Port:  clang-3.9 clang-4.0 llvm-3.9        |
  llvm-4.0                                       |
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Comment (by kencu):

 mmm. probably not that, I guess, looking at the logs. libc++ is installed
 on 10.6 as a dependency during the build, and the build is configured to
 use it.

 could this be relevant:
 {{{
 sh: pkg-config: command not found
 }}}

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Ticket URL: <https://trac.macports.org/ticket/53931#comment:2>
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