[MacPorts] #54370: gmic @2.0.2: buildbot build gets cancelled because 20 minutes go by with no output

[MacPorts]

#54370: gmic @2.0.2: buildbot build gets cancelled because 20 minutes go by with no
output
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  Reporter:  ryandesign  |      Owner:  Schamschula
      Type:  defect      |     Status:  reopened
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  haspatch
      Port:  gmic        |
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Comment (by mascguy):

 Replying to [comment:19 ryandesign]:
 > Great, then my proposal to blacklist `{clang <902}` should fix the
 problem.

 Sounds like a good approach Ryan, and hopefully that will resolve this.

 If not, I'm willing to assist with diagnosis on older macOS releases, when
 I can find some time.

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Ticket URL: <https://trac.macports.org/ticket/54370#comment:20>
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