gnome-extra/avant-window-navigator
Fully customisable dock-like window navigator.
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doc
Global: Adds extra documentation (API, Javadoc, etc)
gnome
Global: Adds GNOME support
xfce
Global: Adds integration with Xfce4 desktop environment
Local: Enable support for libs XFCE provides
debug
Global: Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see http://www.gentoo.org/proj/en/qa/backtraces.xml