shoshin:adoc kludge$ a2x --verbose --keep-artifacts -f epub adoc.txt
a2x: args: ['--verbose', '--keep-artifacts', '-f', 'epub', 'adoc.txt']
a2x: executing: /opt/local/bin/asciidoc --backend docbook  --verbose  --out-file /Users/kludge/adoc/adoc.xml /Users/kludge/adoc/adoc.txt
asciidoc: reading: /opt/local/etc/asciidoc/asciidoc.conf
asciidoc: reading: /opt/local/etc/asciidoc/asciidoc.conf
asciidoc: reading: /Users/kludge/adoc/adoc.txt
asciidoc: reading: /opt/local/etc/asciidoc/docbook45.conf
asciidoc: reading: /opt/local/etc/asciidoc/filters/code/code-filter.conf
asciidoc: reading: /opt/local/etc/asciidoc/filters/graphviz/graphviz-filter.conf
asciidoc: reading: /opt/local/etc/asciidoc/filters/latex/latex-filter.conf
asciidoc: reading: /opt/local/etc/asciidoc/filters/music/music-filter.conf
asciidoc: reading: /opt/local/etc/asciidoc/filters/source/source-highlight-filter.conf
asciidoc: reading: /opt/local/etc/asciidoc/lang-en.conf
asciidoc: writing: /Users/kludge/adoc/adoc.xml
a2x: executing: xmllint --nonet --noout --valid /Users/kludge/adoc/adoc.xml
a2x: deleting /Users/kludge/adoc/adoc.epub.d
a2x: creating /Users/kludge/adoc/adoc.epub.d
a2x: chdir /Users/kludge/adoc/adoc.epub.d
a2x: executing: xsltproc  --stringparam callout.graphics 0 --stringparam navig.graphics 0 --stringparam admon.textlabel 1 --stringparam admon.graphics 0  /opt/local/etc/asciidoc/docbook-xsl/epub.xsl /Users/kludge/adoc/adoc.xml
warning: failed to load external entity "http://docbook.sourceforge.net/release/xsl/current/epub/docbook.xsl"
compilation error: file /opt/local/etc/asciidoc/docbook-xsl/epub.xsl line 13 element import
xsl:import : unable to load http://docbook.sourceforge.net/release/xsl/current/epub/docbook.xsl
a2x: ERROR: xsltproc  --stringparam callout.graphics 0 --stringparam navig.graphics 0 --stringparam admon.textlabel 1 --stringparam admon.graphics 0  /opt/local/etc/asciidoc/docbook-xsl/epub.xsl /Users/kludge/adoc/adoc.xml returned non-zero exit status 5
a2x: chdir /Users/kludge/adoc