[MacPorts] #58347: Error: Failed to build dvisvgm: command execution failed

[MacPorts]

#58347: Error: Failed to build dvisvgm: command execution failed
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  Reporter:  dbl001   |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.5.4
Resolution:           |   Keywords:
      Port:  dvisvgm  |
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Comment (by Ionic):

 Okay, so my analysis was wrong, but it must still be using a feature (no
 idea which one) only available in clang-6.0+ and not older versions.

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Ticket URL: <https://trac.macports.org/ticket/58347#comment:8>
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