[MacPorts] #68408: CI doesn't build ports in dependency order (was: Latest commits to mpbb have broken CI)

[MacPorts]

#68408: CI doesn't build ports in dependency order
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  Reporter:  barracuda156   |      Owner:  jmroot
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  buildbot/mpbb  |    Version:  2.8.1
Resolution:                 |   Keywords:
      Port:                 |
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Comment (by jmroot):

 While there was an issue with mpbb, it only affected what is supposed to
 be a very rare case: when a dependency of the port being built has not
 itself been built yet. It only caused noticeable problems because the CI
 script appears to be simply building changed ports in the order they
 appear in the git diff, rather than in dependency order.

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Ticket URL: <https://trac.macports.org/ticket/68408#comment:3>
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