From Gentoo Wiki
Lumina is a lightweight desktop environment, free of D-Bus and *kit, designed to have as few system dependencies and requirements as possible.
The x11-wm/lumina package is configurable by one use flag:
USE flags for x11-wm/lumina Lumina desktop environment
||Build and install lumina's desktop-utils|
To install Lumina desktop, run:
emerge --ask x11-wm/lumina
For alternative ebuilds from other repositories see gpo.zugaina.org.
A configuration file is installed in /etc/luminaDesktop.conf. Lumina also has a bunch of own configuration tools.
Lumina provides its own replacement for startx to be started from console.
Alternatively it can be added to the ~./xinitrc file for being started via startx or a display manager
# https://wiki.archlinux.org/index.php/X_resources#Adding_to_xinitrc [[ -f ~/.Xresources ]] && xrdb -merge -I$HOME ~/.Xresources exec start-lumina-desktop