[MacPorts] #33847: clang-2.9, clang-3.0, clang3.1: /opt/local/libexec/llvm-*/bin/ld already exists and does not belong to a registered port

[MacPorts]

#33847: clang-2.9, clang-3.0, clang3.1: /opt/local/libexec/llvm-*/bin/ld already
exists and does not belong to a registered port
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 Reporter:  ryandesign@…             |       Owner:  jeremyhu@…                     
     Type:  defect                   |      Status:  assigned                       
 Priority:  Normal                   |   Milestone:                                 
Component:  ports                    |     Version:  2.0.4                          
 Keywords:                           |        Port:  clang-2.9, clang-3.0, clang-3.1
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Comment(by ryandesign@…):

 Yes, do it in pre-activate. It should work fine. I've done it in other
 ports before.

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Ticket URL: <https://trac.macports.org/ticket/33847#comment:3>
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