[MacPorts] #31504: canna @3.7p3_3: fails to install if xmkmf is built by clang

[MacPorts]

#31504: canna @3.7p3_3: fails to install if xmkmf is built by clang
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 Reporter:  takanori@…             |       Owner:  macports-tickets@…                   
     Type:  defect                 |      Status:  new                                  
 Priority:  Normal                 |   Milestone:                                       
Component:  ports                  |     Version:  2.0.3                                
 Keywords:                         |        Port:                                       
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Comment(by takanori@…):

 This is because clang cannot interpret Concat3() macro properly which is
 declared in Imake.rules.

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Ticket URL: <https://trac.macports.org/ticket/31504#comment:1>
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