Command explanations --enable-static-libpam : This command builds static PAM libraries as well as the dynamic libraries. --with-mailspool=/var/mail : This command makes the mailspool directory FHS compliant. --enable-both-confs : This command lets the local administrator choose which configuration file setup to use. mv /lib/libpam.a /lib/libpam_misc.a /lib/libpamc.a /usr/lib : This command move the static libraries to /usr/lib to comply with FHS.