[MacPorts] #64678: llvm-5.0 fails to configure on 10.4.11

[MacPorts]

#64678: llvm-5.0 fails to configure on 10.4.11
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 Reporter:  barracuda156          |      Owner:  (none)
     Type:  defect                |     Status:  new
 Priority:  Normal                |  Milestone:
Component:  ports                 |    Version:  2.7.1
 Keywords:  powerpc, tiger, llvm  |       Port:  llvm-5.0
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 There is a whole bunch of errors like:

 {{{
 Attempting to use @rpath without CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG being
 set.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/64678>
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