HEAD build error on Fedora 39

Hi,

I'm unable to build the latest snapshot on my Fedora 39 box. I think
this problem appeared before the weekend (not sure, though). This is
libxml 2.10.4:

===============================================================
'/usr/bin/perl' ../../../src/backend/utils/activity/generate-wait_event_types.pl --docs ../../../src/backend/utils/activity/wait_event_names.txt
/usr/bin/xmllint --nonet --path . --path . --output postgres-full.xml --noent --valid postgres.sgml
I/O error : Attempt to load network entity http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd
postgres.sgml:21: warning: failed to load external entity "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd"
]>
^
postgres.sgml:23: element book: validity error : No declaration for attribute id of element book
<book id="postgres">
^
postgres.sgml:24: element title: validity error : No declaration for element title
<title>PostgreSQL &version; Documentation</title>
^
postgres.sgml:27: element corpauthor: validity error : No declaration for element corpauthor
<corpauthor>The PostgreSQL Global Development Group</corpauthor>
^
postgres.sgml:28: element productname: validity error : No declaration for element productname
<productname>PostgreSQL</productname>
^
postgres.sgml:29: element productnumber: validity error : No declaration for element productnumber
<productnumber>&version;</productnumber>
^
postgres.sgml:3: element date: validity error : No declaration for element date
legal.sgml:6: parser error : Entity 'ndash' not defined
<year>1996&ndash;2024</year>
^
legal.sgml:14: parser error : Entity 'copy' not defined
<productname>PostgreSQL</productname> is Copyright &copy; 1996&ndash;2024
^
legal.sgml:14: parser error : Entity 'ndash' not defined
<productname>PostgreSQL</productname> is Copyright &copy; 1996&ndash;2024
^
legal.sgml:19: parser error : Entity 'copy' not defined
<productname>Postgres95</productname> is Copyright &copy; 1994&ndash;5
^
legal.sgml:19: parser error : Entity 'ndash' not defined
<productname>Postgres95</productname> is Copyright &copy; 1994&ndash;5
^
legal.sgml:49: parser error : chunk is not well balanced

^
postgres.sgml:30: parser error : Entity 'legal' failed to parse
&legal;
^
make[3]: *** [Makefile:72: postgres-full.xml] Error 1

====================================================

Any hints?

Regards

--
Devrim Gündüz
Open Source Solution Architect, PostgreSQL Major Contributor
Twitter: @DevrimGunduz , @DevrimGunduzTR