In Ubuntu-docs, the DeskTop help only, when compiling the HTML yelp-build wants to copy a file called "yelp-note-advanced.png". However no such file exists and the resulting html and css files don't reference it. Example:

cp: cannot stat ‘/usr/share/yelp-xsl/icons/hicolor/24x24/status/yelp-note-advanced.png’: No such file or directory

This seems to be in /usr/bin/yelp-build itself:

        echo '    <xsl:text>'"${yelp_icon_dir}"'/yelp-note-advanced.png ./&#x000A;</xsl:text>'

The desire here is to eliminate extraneous error listings during compile.