debug - Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
ebook - Add support for various ebook formats using app-text/libebook
epub - Add support for conversion to ePub format using app-text/libepubgen
freehand - Add support for freehand format using media-libs/libfreehand
gsf - Add support for structured files using gnome-extra/libgsf
keynote - Add support for keynote format using app-text/libetonyek
mspub - Add support to mspub format using app-text/libmspub
mwaw - Add support to mwaw formats using app-text/libmwaw
pagemaker - Add support to pagemaker formats using media-libs/libpagemaker
qxp - Add support for QuarkXpress documents using app-text/libqxp
visio - Add support for visio format using media-libs/libvisio
wpd - Add support for wpd format using app-text/libwpd
wpg - Add support for wpg format using app-text/libwpg
wps - Add support for wps format using app-text/libwps
zmf - Add support for Zoner Callisto/Draw documents format using media-libs/libzmf
