user-manual.xml: user-manual.txt user-manual.conf
$(ASCIIDOC) -b docbook -d book $<
-XSLT = http://docbook.sourceforge.net/release/xsl/current/html/docbook.xsl
+XSLT = docbook.xsl
XSLTOPTS = --xinclude --stringparam html.stylesheet docbook-xsl.css
user-manual.html: user-manual.xml