I'd be inclined to just have a file with the a list and do something like the following at the end of Makefile.inc1, just after we do the sendmail install.
.if (PURGE_OBSOELETE_FILES) @rm -fr `cat /etc/obsolete` .else if (SAVE_ONSOLETE_FILES) @mkdir /usr/obsolete @mv -f `cat /etc/obsolete` /usr/obsolete .endif Warner To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message