systemdstatedir is created by tmpfiles conf (tmpfiles.d/systemd.conf.in)
already.
By shipping it, systemd prevents the effect of tmpfiles.d/var.conf.in:
q /var 0755 - - -
This should helps implementing the "Hermetic /usr" pattern.
Links: https://0pointer.net/blog/fitting-everything-together.html
install_subdir('LICENSES',
install_dir : docdir)
-install_emptydir(systemdstatedir)
-
#####################################################################
# Ensure that changes to the docs/ directory do not break the