[MacPorts] #69381: opencv4 @4.8.0_4+contrib build failure

[MacPorts]

#69381: opencv4 @4.8.0_4+contrib build failure
----------------------+----------------------------
  Reporter:  fmw42    |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.9.1
Resolution:           |   Keywords:  Ventura, arm64
      Port:  opencv4  |
----------------------+----------------------------

Comment (by fmw42):

 A cleaning  of all my ports and then installing py312-opencv4 finally
 worked.  **SUCCESS**

 Today, I tried removing all my ports with `sudo port -fp uninstall
 installed`.  Then I tried installing py312-opencv4 before installing any
 other ports.  I got the following error messages:

 {{{
 Error: Requested variants "" do not match those the build was started
 with: "+contrib".
 Error: Please use the same variants again, or run 'port clean opencv4'
 first to remove the existing partially completed build.
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_opencv4/opencv4/main.log
 for details.
 Error: Follow https://guide.macports.org/#project.tickets if you believe
 there
 is a bug.
 Error: Processing of port py312-opencv4 failed
 }}}

 So I then cleaned opencv4 with `sudo port clean opencv4` and tried again
 to install py312-opencv4.  This time, I got py312-opencv4 to install
 without complaint. I then finished installing my other ports.

 Question:  Why did I get the message that opencv4 needed cleaning when I
 had removed every one of my ports.

 I do not understand why I could not install py39-opencv4 before. I guess
 there was a conflict with one of the ports previously installed and the
 previous attempts to install py39-opencv4 did not overwrite that port with
 the needed version or dependencies.  Perhaps the conflict was with
 OpenEXR. Or perhaps py39-opencv4 was the issue.

-- 
Ticket URL: <https://trac.macports.org/ticket/69381#comment:22>
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