Please see the README for instructions common to all platforms and descriptions of the options mentioned here. Linux. Most modern Linux distributions use Linux-PAM with a password changing module which understands "use_authtok". Thus, you may choose which module prompts for the old password, things should work either way. FreeBSD. As of this writing (April 2002), FreeBSD-current is moving to OpenPAM which pam_passwdqc already includes support for. The next step would be for FreeBSD to start actually using PAM from password changing. Once that becomes a reality, you should be able to use pam_passwdqc with FreeBSD. Solaris. pam_passwdqc has to ask for the old password during the update phase. Use "ask_oldauthtok=update check_oldauthtok" with pam_passwdqc and "use_first_pass" with pam_unix. You will likely also need to set "max=8" in order to actually enforce not-so-weak passwords with the obsolete "traditional" crypt(3) hashes that most Solaris systems use. Of course this way you only get about one third of the functionality of pam_passwdqc.