FreeBSD web build failed on build-web.stream.freebsd.org

[User Www-data]

===> releases/9.1R
===> releng
===> search
===> search/opensearch
===> security
===> security/advisories
===> security/patches
===> snapshots
===> support
===> doc
===> doc/articles (all)
===> doc/articles/bsdl-gpl (all)
/usr/bin/grep '^<?xml version=.*?>' article.xml > article.parsed.xml.tmp
echo '<!DOCTYPE article PUBLIC "-//FreeBSD//DTD DocBook XML V4.5-Based Extension//EN" "../../../share/xml/freebsd45.dtd">' >> article.parsed.xml.tmp
==> Basic validation
env XML_CATALOG_FILES="file:///home/www/build/head/en_US.ISO8859-1/articles/bsdl-gpl/catalog-cwd.xml  file:///home/www/build/head/en_US.ISO8859-1/share/xml/catalog.xml  file:///home/www/build/head/share/xml/catalog.xml  file:///home/www/build/head/share/xml/catalog-common.xml  file:///usr/local/share/xml/catalog" /usr/local/bin/xmllint --nonet --noent --valid --xinclude --dropdtd /home/www/build/head/en_US.ISO8859-1/articles/bsdl-gpl/article.xml |  /usr/bin/grep -v '^<?xml version=.*?>' >> article.parsed.xml.tmp
/home/www/build/head/share/xml/freebsd45.dtd:60: warning: failed to load external entity "/usr/local/share/xml/docbook/4.5/docbookx.dtd"
%orig-docbook;
              ^
Entity: line 1: 
 %orig-docbook; 
               ^
/home/www/build/head/share/xml/freebsd45.dtd:76: validity error : PEReference: %cptr.char.mix; not found
<!ELEMENT hostid (%cptr.char.mix;)*>
                                 ^
/home/www/build/head/share/xml/freebsd45.dtd:76: parser error : ContentDecl : Name or '(' expected
<!ELEMENT hostid (%cptr.char.mix;)*>
                                 ^
/home/www/build/head/share/xml/freebsd45.dtd:76: parser error : expected '>'
<!ELEMENT hostid (%cptr.char.mix;)*>
                                 ^
/home/www/build/head/share/xml/freebsd45.dtd:76: parser error : Content error in the external subset
<!ELEMENT hostid (%cptr.char.mix;)*>
                                 ^
*** [article.parsed.xml] Error code 1

Stop in /home/www/build/head/en_US.ISO8859-1/articles/bsdl-gpl.
*** [all] Error code 1

Stop in /home/www/build/head/en_US.ISO8859-1/articles.
*** [all] Error code 1

Stop in /home/www/build/head/en_US.ISO8859-1.
*** [all-all] Error code 1

Stop in /home/www/build/head/en_US.ISO8859-1/htdocs/doc.
*** [all] Error code 1

Stop in /home/www/build/head/en_US.ISO8859-1/htdocs.
        3.87 real         1.86 user         2.14 sys