There are some known problems for "make build":

To bootstrap (f)lex copy inetscan.c to scan.c.
Install lib/libcurses/curses.h before compiling lib/libterm.
Install lint before using it to build llibs...

This version fixes a bug in opt6_ctlinput(ip6_input.c).
addrconf6 works but is not finished, ndpd is still
under way.
