Install Steam
Enable steam repository
eselect repository enable 367
Set useflags
echo 'games-util/steam-launcher vulkan udev steamruntime -joystick desktop-portal wayland' > /etc/portage/package.use/steam-launcher
Set ABI_X86
cat << 'EOF' >> /etc/portage/make.conf
#############################################################################################################
# This is for steam
#############################################################################################################
ABI_X86="64 32"
EOF
Steam uses Zenity for certain graphical pop-ups, such as error messages or script loading. If you haven't installed it, you can quickly add it to avoid any complaints
emerge -av gnome-extra/zenity