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

[User Www-data]

/usr/local/www/build/head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml:3675: parser error : attributes construct error
	  <xlink:href="http://distcache.FreeBSD.org">http://distcache.FreeBSD.org</link
	             ^
/usr/local/www/build/head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml:3675: parser error : Couldn't find end of Start Tag href line 3675
	  <xlink:href="http://distcache.FreeBSD.org">http://distcache.FreeBSD.org</link
	             ^
/usr/local/www/build/head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml:7526: parser error : chunk is not well balanced

^
/usr/local/www/build/head/en_US.ISO8859-1/books/porters-handbook/book.xml:71: parser error : Failure to process entity chap.makefiles
  &chap.makefiles;
                  ^
/usr/local/www/build/head/en_US.ISO8859-1/books/porters-handbook/book.xml:71: parser error : Entity 'chap.makefiles' not defined
  &chap.makefiles;
                  ^
*** [book.parsed.xml] Error code 1

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1 error

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*** [all] Error code 2

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1 error

make[3]: stopped in /usr/local/www/build/head/en_US.ISO8859-1/books
*** [all] Error code 2

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1 error

make[2]: stopped in /usr/local/www/build/head/en_US.ISO8859-1
*** [all-all] Error code 2

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1 error

make[1]: stopped in /usr/local/www/build/head/en_US.ISO8859-1/htdocs/doc
*** [all] Error code 2

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1 error

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        5.45 real         2.34 user         3.64 sys

latestrevision.timestamp "2017-10-14 07:33:11" 
latestrevision.committer "ak"		
latestrevision.number "51121"