saslauthd error, pam configuration

i am getting this error

postfix/smtpd[20629]: warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory

probably better explained by :

testsaslauthd -u cyrus -p cyrus
0: NO “authentication failed”
Mar 16 16:41:01 h1441418 saslauthd[7091]: PAM unable to dlopen(/lib/security/ /lib/security/ cannot open shared object file: No such file or directory

this is probably because /lib/security/ does not exist but /lib64/security/ does

does anybody know which file should I create or edit (in /etc/pam.d ?) to fix the path for saslauthd / pam when trying to set up a TSL secure smtp connection?

tnx. in advance