Trying to do "bmake OUTPUTS=html" in pkgsrc/doc/guide is failing with:

===> Building for pkgsrc-guide-20070503
[Checking tools for typesetting...OK]
env SGML_CATALOG_FILES= 
XML_CATALOG_FILES="file:///build/reed/tmp/pkgsrc/doc/guide/work.reed/pkgsrc-guide-20070503/../htdocs/en/share/xml/catalog.xml  
file:///build/reed/tmp/pkgsrc/doc/guide/work.reed/pkgsrc-guide-20070503/../htdocs/share/xml/catalog.xml  
file:///build/reed/tmp/pkgsrc/doc/guide/work.reed/pkgsrc-guide-20070503/../htdocs/share/xml/catalog-common.xml 
file:///home/reed/pkg/etc/xml/catalog" /home/reed/pkg/bin/xsltproc 
--xinclude --nonet --catalogs   --param manifest "'HTML.manifest'" --param 
toc.section.depth "'2'" --param toc.max.depth "'8'" --param 
generate.section.toc.level "'0'" --param section.autolabel "'1'" --param 
section.label.includes.component.label "'1'" --param 
netbsd.url.image.bsddaemon 
"'../../../../../../../../images/BSD-daemon.jpg'" --param 
netbsd.url.disclaimer "''" --param html.stylesheet "'/NetBSD.css'" --param use.id.as.filename 
"'1'" --param citerefentry.link "'1'" --param callout.graphics.path 
"'./imagelib/callouts/'" -o pkgsrc.html  
/build/reed/tmp/pkgsrc/doc/guide/work.reed/pkgsrc-guide-20070503/share/default-html.xsl 
default.xml
I/O error : Attempt to load network entity 
http://www.oasis-open.org/docbook/xml/4.2/dbcentx.mod
file:///build/reed/tmp/pkgsrc/doc/guide/work.reed/htdocs/share/xml/xslt10-netbsd.dtd:16: 
warning: failed to load external entity 
"http://www.oasis-open.org/docbook/xml/4.2/dbcentx.mod"
%dbcentx.mod;
             ^
Entity: line 1: 
 %dbcentx.mod; 
              ^
I/O error : Attempt to load network entity 
http://docbook.sourceforge.net/release/xsl/current/html/docbook.xsl
warning: failed to load external entity 
"http://docbook.sourceforge.net/release/xsl/current/html/docbook.xsl"
compilation error: file 
file:///build/reed/tmp/pkgsrc/doc/guide/work.reed/htdocs/share/xsl/netbsd-docbook-html.xsl 
line 16 element import
xsl:import : unable to load 
http://docbook.sourceforge.net/release/xsl/current/html/docbook.xsl
*** Error code 5


I have installed:

docbook-xml-4.4nb4  XML DTD designed for computer documentation
docbook-xsl-1.72.0  Docbook XSL modular stylesheet
dsssl-docbook-modular-1.79nb2 DSSSL stylesheets for the DocBook DTD
opensp-1.5.2        SGML parser, successor to "sp"
tidy-20051026       Fixes and tidies up HTML files
libxslt-1.1.20      XSLT parser library from the GNOME project
docbook-4.4nb2      SGML DTD designed for computer documentation



  Jeremy C. Reed