Before you install this package, you may want to have a look at the lfs hint. It discusses how you can make your system more secure regarding passwords, such as how to enable the more secure MD5 passwords, and how to get the most out of this Shadow package. Install the Shadow Password Suite by running the following commands: ./configure --prefix=/usr --enable-shared && make && make install && cp etc/{limits,login.access} /etc && sed 's%/var/spool/mail%/var/mail%' \     etc/login.defs.linux > /etc/login.defs && ln -sf vipw /usr/sbin/vigr && rm /bin/vipw && mv /bin/sg /usr/bin && mv /lib/{libmisc.*a,libshadow.*a} /usr/lib && ln -s ../../lib/libshadow.so /usr/lib