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+To activate debug level, add to units under [Service] this line
+Environment=SYSTEMD_LOG_LEVEL=debug
+
+Note on systemd-versions: Some systemds below 204 (verified in
+systemd-195) seem to need libpci-dev (or the openSuse equivalent).
+
+
+Another note on our compiled systemd-udevd:
+So far it has not been possible to reach a fully functional udev
+system in view of the perceived systemd-udevd limitation about
+evaluating the variable ENV{DEVTYPE}=="usb_device" in udev rule
+scripts.