XDG_RUNTIME_DIR and Gentoo
On systemd/ConsoleKit systems this variable is set when the user logs in, if neither is used and you need XDG_RUNTIME_DIR for some reason (eg Flatpak), it can be easily set adding some lines to your .bash_profile:
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if test -z "${XDG_RUNTIME_DIR}"; then
export XDG_RUNTIME_DIR=/tmp/${UID}-runtime-dir
if ! test -d "${XDG_RUNTIME_DIR}"; then
mkdir "${XDG_RUNTIME_DIR}"
chmod 0700 "${XDG_RUNTIME_DIR}"
fi
fi