gnome-doc-tool --version (return code: 0)
gnome-doc-html (gnome-doc-utils) 0.20.10
gnome-doc-tool --help (return code: 1)
Usage: gnome-doc-tool <COMMAND> [OPTIONS] FILES...
Process a documentation file.
COMMAND is one of:
list-icons list automatic icons and watermarks
list-media list all referenced media files
html convert the documents to HTML
xhtml convert the documents to XHTML
css create a CSS file for a Mallard document
help display this help and exit