[MacPorts] #39699: Unable to build due to unknown compiler version?

[MacPorts]

#39699: Unable to build due to unknown compiler version?
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 Reporter:  frankdmartinez@…  |      Owner:  macports-tickets@…
     Type:  defect            |     Status:  new
 Priority:  High              |  Milestone:
Component:  ports             |    Version:  2.1.3
 Keywords:                    |       Port:
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 Running on 10.5, trying to build anything available thru MP, I receive
 this diagnostic: Unable to open port: can't set "compiler.blacklist":
 couldn't determine build number of compiler "clang". I have searched the
 web for a work-around and found nothing. If Anyone could point Me in the
 direction of information on how to either work around this error, fix it,
 or avoid it entirely, I would be most appreciative because, otherwise, MP
 simply will not work.

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Ticket URL: <https://trac.macports.org/ticket/39699>
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