[MacPorts] #69428: mariadb*: fails to build with libxml2 2.12.x

[MacPorts]

#69428: mariadb*: fails to build with libxml2 2.12.x
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  Reporter:  amstilp                             |      Owner:  michaelld
      Type:  defect                              |     Status:  assigned
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:
      Port:  mariadb mariadb-10.0 mariadb-10.1   |
  mariadb-10.2 mariadb-10.3 mariadb-10.4         |
  mariadb-10.5 mariadb-10.6 mariadb-10.7         |
  mariadb-10.8 mariadb-10.9 mariadb-10.10        |
  mariadb-10.11                                  |
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Comment (by jmroot):

 I had a look at updating these and gave up before long because it became
 clear I didn't have the time to do it that day, as I suspect others have
 done before me. Unfortunately they are daunting even for experienced port
 authors. Just as one example, it looks like they could be simplified by
 using the official release tarballs instead of GitHub generated archives,
 but I don't know if the origin author had a good reason for doing it that
 way.

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Ticket URL: <https://trac.macports.org/ticket/69428#comment:18>
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