help, rogue file on hosed system

[Paul Harris <harri-pc@ee.uwa.edu.au>]

hi,
I found that a file from libc6-dev has been hosed with the system, its
permissions are now:

c---r-----   1 12320    8224      32,  48 Jan 30  1987 /usr/lib/crt1.o

but I can't do anything with it...

c69:~# rm /usr/lib/crt1.o 
rm: remove `/usr/lib/crt1.o', overriding mode 0040? y
rm: /usr/lib/crt1.o: Operation not permitted

nor can I change any permissions or ownership.
I created a fake user with that user id and group id, but I still could
not do anything to it...

how do I get rid of this file?

thanks,
Paul