Install the Shadow Password Suite by running the following commands: cp src/useradd.c src/useradd.c.backup && sed 's/\(.*\) (nflg || \(.*\))\(.*\)/\1\2\3/' \    src/useradd.c > tmp~ && mv tmp~ 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 && cd /lib && mv libshadow.a /usr/lib && mv libshadow.la /usr/lib && ln -sf libshadow.so.0 libshadow.so && cd /usr/lib && ln -sf ../../lib/libshadow.so