[MacPorts] #64558: libomp @13.0.0_1 fails to build on 10.6

[MacPorts]

#64558: libomp @13.0.0_1 fails to build on 10.6
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 Reporter:  jmroot       |      Owner:  eborisch
     Type:  defect       |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  snowleopard  |       Port:  libomp
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 https://build.macports.org/builders/ports-10.6_x86_64-builder/builds/91774/steps
 /install-port/logs/stdio

 Looks like the fix for #64549 caused it. This is a problem because the
 default compiler on 10.6 depends on libomp. It has to be built with
 clang-3.7 there because of that dependency.

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Ticket URL: <https://trac.macports.org/ticket/64558>
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