Installation

eselect-repository

Run:
# eselect repository add lepz0r-overlay git https://github.com/lepz0r/lepz0r-overlay && emerge --sync lepz0r-overlay

Manual

edit /etc/portage/repos.conf/lepz0r-overlay.conf

[lepz0r-overlay]
priority = 50
location = /var/db/repos/lepz0r-overlay
sync-type = git
sync-uri = https://github.com/lepz0r/lepz0r-overlay.git
auto-sync = Yes

And run:
emerge --sync lepz0r-overlay

Changes from original Gentoo's ebuild:

Patches are only applied if it's useflags are enabled

Patches from AUR

media-video/mpv : mpv-pipewire (0.34.x only, merged in 0.35)
app-misc/ranger : ranger-sixel
gui-libs/wlroots : wlroots-nvidia