"Extras" contains several weird C sources.  They should be checked.
Still gotta fix Mail
Gotta make sure the Make onceonly installs /etc/MailAliases and /usr/spool/locks
Should make a whole subsection for installing the News stuff.  It should
all be in a subdirectory with its own makefile, in fact, since it basically
is an entirely separate module from the other stuff.

Berkeley seems to have their own program called "l" in /usr/ucb.  

Some systems purge /usr/tmp in their /etc/rc file, thus destroying the
/usr/tmp/mh directory.  MH programs which need that directory should attempt
to make it if it is not there.