[MacPorts] #64470: opencv4 not installed on MacOS Catalina 10.15.7

[MacPorts]

#64470: opencv4 not installed on MacOS Catalina 10.15.7
----------------------+--------------------
  Reporter:  iglaweb  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  High     |  Milestone:
 Component:  ports    |    Version:  2.7.1
Resolution:           |   Keywords:
      Port:  opencv4  |
----------------------+--------------------

Comment (by iglaweb):

 What java version should I have?

 :info:configure configure: error: Java version 1.3 or higher required, got
 14.0.2
 :info:configure Command failed:  cd
 "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_databases_db48/db48/work/db-4.8.30/build_unix"
 && ../dist/configure --prefix=/opt/local --enable-cxx
 --includedir=\${prefix}/include/db48 --libdir=\${prefix}/lib/db48
 --enable-java
 :info:configure Exit code: 1

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Ticket URL: <https://trac.macports.org/ticket/64470#comment:1>
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