[MacPorts] #62693: cctools (presumably): No port llvm-10 found in the index

[MacPorts]

#62693: cctools (presumably): No port llvm-10 found in the index
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  Reporter:  thetrial  |      Owner:  jeremyhu
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.4
Resolution:            |   Keywords:  legacy-os, elcapitan
      Port:  cctools   |
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Comment (by thetrial):

 Still the same here. This is really strange due to there is no log or
 clear statement except »Warning: No port llvm-10 found in the index«.

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Ticket URL: <https://trac.macports.org/ticket/62693#comment:4>
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