$ make
cd /usr/src/release/doc/en_US.ISO8859-1/hardware/../../share/xml && make MAN2HWNOTES_FLAGS= dev-auto.ent
`dev-auto.ent' is up to date.
cd /usr/src/release/doc/en_US.ISO8859-1/hardware/../../share/xml && make MAN2HWNOTES_FLAGS= dev-auto.ent
`dev-auto.ent' is up to date.
env XML_CATALOG_FILES="file:///usr/obj/usr/src/release/doc/en_US.ISO8859-1/hardware/catalog-cwd.xml  file:///usr/doc/en_US.ISO8859-1/share/xml/catalog.xml  file:///usr/doc/share/xml/catalog.xml  file:///usr/local/share/xml/catalog file:///usr/src/release/doc/en_US.ISO8859-1/hardware/../../en_US.ISO8859-1/share/xml/catalog.xml  file:///usr/src/release/doc/en_US.ISO8859-1/hardware/../../share/xml/catalog.xml" /usr/local/bin/xmllint --nonet --noent --valid --dropdtd --xinclude /usr/src/release/doc/en_US.ISO8859-1/hardware/article.xml > article.parsed.xml.tmp
==> Profiling
env XML_CATALOG_FILES="file:///usr/obj/usr/src/release/doc/en_US.ISO8859-1/hardware/catalog-cwd.xml  file:///usr/doc/en_US.ISO8859-1/share/xml/catalog.xml  file:///usr/doc/share/xml/catalog.xml  file:///usr/local/share/xml/catalog file:///usr/src/release/doc/en_US.ISO8859-1/hardware/../../en_US.ISO8859-1/share/xml/catalog.xml  file:///usr/src/release/doc/en_US.ISO8859-1/hardware/../../share/xml/catalog.xml" /usr/local/bin/xsltproc --param profile.attribute "'releasetype'" --param profile.value "'snapshot'" http://docbook.sourceforge.net/release/xsl-ns/current/profiling/profile.xsl article.parsed.xml.tmp > article.parsed.xml
/bin/rm article.parsed.xml.tmp
/usr/bin/sed 's|@@URL_RELPREFIX@@|http://www.FreeBSD.org|g' < article.parsed.xml > article.parsed.print.xml
/usr/bin/sed -i '' -e 's|@@URL_RELPREFIX@@|../../../..|g' article.parsed.xml
env XML_CATALOG_FILES="file:///usr/obj/usr/src/release/doc/en_US.ISO8859-1/hardware/catalog-cwd.xml  file:///usr/doc/en_US.ISO8859-1/share/xml/catalog.xml  file:///usr/doc/share/xml/catalog.xml  file:///usr/local/share/xml/catalog file:///usr/src/release/doc/en_US.ISO8859-1/hardware/../../en_US.ISO8859-1/share/xml/catalog.xml  file:///usr/src/release/doc/en_US.ISO8859-1/hardware/../../share/xml/catalog.xml" /usr/local/bin/xsltproc --param release.url "'https://www.FreeBSD.org/snapshots/'" --param release.branch "'12-CURRENT'" --param release.maillist "'current'" --param toc.section.depth "'3'" --xinclude --nonet --maxvars 20000  http://www.FreeBSD.org/release/XML/share/xml/release.xsl article.parsed.xml > article.html
runtime error: file file:///usr/doc/share/xml/freebsd-common.xsl line 56 element value-of
Variable 'latestrevision.timestamp' has not been declared.
xmlXPathCompiledEval: evaluation failed
runtime error: file file:///usr/doc/share/xml/freebsd-common.xsl line 56 element value-of
XPath evaluation returned no result.
*** Error code 10

Stop.
make: stopped in /usr/src/release/doc/en_US.ISO8859-1/hardware