In my /usr/xsrc, I have lots of .depend files and Makefiles.  Here's a 
partial sample from a 'cvs update':

? xc/lib/Xdmcp/.depend
? xc/lib/Xdmcp/Makefile
? xc/lib/Xdpms/.depend
? xc/lib/Xdpms/Makefile

What's the right way to clean them out?  'make clean' in /usr/xsrc 
doesn't work:

# make clean
make -f xmakefile clean
make: cannot open xmakefile.

make: stopped in /usr/xsrc/xfree/xc
*** Error code 2

Stop.
make: stopped in /usr/xsrc/xfree/xc
*** Error code 1 (ignored)
make: don't know how to make clean. Stop

make: stopped in /usr/xsrc/local
*** Error code 2 (ignored)


		--Steve Bellovin, http://www.research.att.com/~smb