[MacPorts] #34214: Install clang development headers

[MacPorts]

#34214: Install clang development headers
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 Reporter:  jonesc@…                  |       Owner:  jeremyhu@…           
     Type:  enhancement               |      Status:  assigned             
 Priority:  Normal                    |   Milestone:                       
Component:  ports                     |     Version:  2.0.4                
 Keywords:                            |        Port:  clang-3.1            
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Comment(by jeremyhu@…):

 They should support an LLVM_CONFIG environment variable which lets you
 provide the llvm-config that you want to use.

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Ticket URL: <https://trac.macports.org/ticket/34214#comment:22>
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