[MacPorts] #63643: py39-pyqt5 @5.15.5_0 build failure

[MacPorts]

#63643: py39-pyqt5 @5.15.5_0 build failure
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  Reporter:  khorton   |      Owner:  reneeotten
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.7.1
Resolution:            |   Keywords:
      Port:  py-pyqt5  |
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Comment (by reneeotten):

 Replying to [comment:4 khorton]:
 > I was running sudo port selfupdate && sudo port upgrade outdated.  That
 attempted to update py39-pyqt5 BEFORE updating py39-sip4.

 ah, that explains it... well I don't think there is a way to say that
 {{{py-pip4}}} should be upgrade first, but at least that issue is solved
 now!

 > I have now updated py39-sip4, but py39-pyqt5 still fails to build, but
 the failure is different now.  it fails with:
 >
 > :info:build sh: sip-build-3.9: command not found

 well... that shouldn't be possible as the {{{sip-build-3.9}}} is provided
 by {{{py39-sip}}} but for some reason that build dependency disappeared
 somehow (i.e., my fault). Sorry, I've pushed an update - you should be
 able to do a {{{selfupdate}}} once that change has propagated to the
 mirrors (or right now if you're using a local git checkout of the tree).

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Ticket URL: <https://trac.macports.org/ticket/63643#comment:5>
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