Each time you update or checkout from CVS, you are strongly encouraged to ensure all
previous object files are removed to avoid internal inconsistency in Asterisk.
Normally, this is automatically done with the use of the .cleanme file.  If you
remove .cleanme, a 'make clean' will not be automatically done before the build.
The .cleanme is automatically removed after the first build after the update or
checkout, so there is normally no need to remove the file.