x11-wm/matwm2
Simple EWMH compatible window manager with titlebars and frames
USE Flags
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
xft
Global: Build with support for XFT font renderer (x11-libs/libXft)
xinerama
Global: Add support for the xinerama X11 extension, which allows you to stretch your display across multiple monitors