This problem is with 2.4.18-0.12.

make mrproper doesn't work.  When I cd to /usr/src/linux-2.4.18-0.12 and do a
sudo make mrproper, I get back:

<snip>
rm -f  parport-share.png  parport-multi.png  parport-structure.png 
parport-share.eps  parport-multi.eps  parport-structure.eps
rm -f procfs_example.sgml
make[1]: Leaving directory `/usr/src/linux-2.4.18-0.12/Documentation/DocBook'
make -C ulib clean
make: *** ulib: No such file or directory.  Stop.
make: *** [clean] Error 2


The problem is that ulib really doesn't exist, so all the references to it in
the Makefile are wrong.