Printing with lpr 0.46 fails with: (example)

    Subject: tolkien printer job "<unknown>"
    Date: Mon, 22 Nov 1999 00:35:52 -0500
    From: bin <bin.cmu.edu>
    Reply-To: root.cmu.edu

    Your printer job
    was not printed because it was not linked to the original file

This does not happen on all systems (yet), but once it starts happening it
happens for all print jobs to all printers and can only be worked around by
allowing world read and search access to /var/spool/lpd/* (which raises
security issues).

strace'ing lpd reveals that the daemon spawned to process queue jobs is
doing

	setregid(-1, <random group ID>);
	setreuid(-1, <owner of print job>);

The group ID is random in the sense that a different group ID is "chosen"
every time lpd is restarted; if it happens to use the correct group ID
2(daemon) then printing will work until lpd is again restarted.