Wayland

Weston and other compositors require the XDG_RUNTIME_DIR variable to be set. Simply save the following script in /etc/profile.d/xdg_runtime_dir.sh and re-login to have it set up properly.

if test -z "${XDG_RUNTIME_DIR}"; then
  export XDG_RUNTIME_DIR=/tmp/$(id -u)-runtime-dir
  if ! test -d "${XDG_RUNTIME_DIR}"; then
    mkdir "${XDG_RUNTIME_DIR}"
    chmod 0700 "${XDG_RUNTIME_DIR}"
  fi
fi

This code was taken from Weston's build instructions. Only ${UID} (not present on Alpine Linux) has been replaced with $(id -u).

If using fish, use the following script, placed in /etc/fish/conf.d/xdg_runtime_dir.fish:

if test -z $XDG_RUNTIME_DIR
  set -x XDG_RUNTIME_DIR /tmp/(id -u)-runtime-dir
  if not test -d $XDG_RUNTIME_DIR
    mkdir $XDG_RUNTIME_DIR
    chmod 0700 $XDG_RUNTIME_DIR
  end
end