-

-:1: parser error : Document is empty

^
make: *** [doc/manual/local.mk:32: doc/manual/manual.is-valid] Error 1
/usr/bin/xsltproc --nonet  --param section.autolabel 1 --param section.label.includes.component.label 1 --param html.stylesheet \'style.css\' --param xref.with.number.and.title 1 --param toc.section.depth 3 --param admon.style \'\' --param callout.graphics.extension \'.gif\' --param contrib.inline.enabled 0 --stringparam generate.toc "book toc" --param keep.relative.image.uris 0 --novalid --stringparam profile.condition manual \
  http://docbook.sourceforge.net/release/xsl-ns/current/profiling/profile.xsl doc/manual/manual.xmli 2> /dev/null | \
  /usr/bin/xmllint --nonet --noout --relaxng http://docbook.org/xml/5.0/rng/docbook.rng -