Install the Shadow Password Suite by running the following commands: mv src/useradd.c useradd.c.temp && sed 's/\(.*\) (nflg || \(.*\)/\1\(\2/' useradd.c.temp > src/useradd.c && ./configure --prefix=/usr && make && make install && cd etc && cp limits login.access /etc && sed "s|/var/spool/mail|/var/mail|" login.defs.linux > /etc/login.defs