Below, are the configuration parameters I use to build squid. After make install, the basic_ldap_auth is not found in /usr/local/libexec. Why? It is interesting as it did create these -rwxr-xr-x 1 root staff 72755 Feb 18 00:40 basic_fake_auth -rwxr-xr-x 1 root staff 103712 Feb 18 00:40 basic_getpwnam_auth -rwxr-xr-x 1 root staff 317249 Feb 18 00:40 basic_msnt_auth -rwxr-xr-x 1 root staff 3954 Feb 18 00:40 basic_msnt_multi_domain_auth -rwxr-xr-x 1 root staff 227438 Feb 18 00:40 basic_ncsa_auth -rwxr-xr-x 1 root staff 128612 Feb 18 00:40 basic_nis_auth -rwxr-xr-x 1 root staff 1460 Feb 18 00:40 basic_pop3_auth -rwxr-xr-x 1 root staff 145564 Feb 18 00:40 basic_radius_auth -rwxr-xr-x 1 root staff 156404 Feb 18 00:40 basic_smb_auth -rwxr-xr-x 1 root staff 2229 Feb 18 00:40 basic_smb_auth.sh -rwxr-xr-x 1 root staff 440976 Feb 18 00:41 cachemgr.cgi -rwxr-xr-x 1 root staff 227340 Feb 18 00:40 digest_file_auth -rwxr-xr-x 1 root staff 197133 Feb 18 00:41 diskd -rwxr-xr-x 1 root staff 158211 Feb 18 00:40 ext_file_userip_acl -rwxr-xr-x 1 root staff 3935 Feb 18 00:40 ext_sql_session_acl -rwxr-xr-x 1 root staff 132251 Feb 18 00:40 ext_unix_group_acl -rwxr-xr-x 1 root staff 4999 Feb 18 00:40 ext_wbinfo_group_acl -rwxr-xr-x 1 root staff 5499 Feb 18 00:41 helper-mux.pl -rwxr-xr-x 1 root staff 12166 Feb 18 00:40 log_db_daemon -rwxr-xr-x 1 root staff 76515 Feb 18 00:40 log_file_daemon -rwxr-xr-x 1 root staff 65044 Feb 18 00:40 negotiate_wrapper_auth -rwxr-xr-x 1 root staff 123618 Feb 18 00:40 ntlm_fake_auth -rwxr-xr-x 1 root staff 210415 Feb 18 00:40 ntlm_smb_lm_auth -rwsr-xr-x 1 root staff 695897 Feb 18 00:41 pinger configure options: '--enable-icap-client' '--enable-gnuregex' '--enable-icmp' '--enable-ssl' '--enable-kill-parent-hack' '--enable-snmp' '--disable-ident-lookups' '--enable-cache-digests' '--enable-eui' '--enable-removal-policies=heap,lru' '--enable-ssl-crtd' '--enable-linux-netfilter' '--enable-auth' '--enable-auth-basic' '--enable-auth-ntlm' '--enable-auth-negotiate' '--enable-auth-digest' '--enable-external-acl-helpers' '--with-maxfd=16384' '--enable-follow-x-forwarded-for' '--with-logdir=/var/log/squid' '--with-squid=/usr/local/src/squid-3.3.1' '--prefix=/usr/local' '--with-default-user=proxy' '--enable-ltdl-convenience' '--disable-ipv6' Also, the config log shows below. configure:21936: Authentication support enabled: yes configure:22011: Basic auth helper LDAP ... found but cannot be built configure:22011: Basic auth helper PAM ... found but cannot be built configure:22011: Basic auth helper SASL ... found but cannot be built configure:22011: Basic auth helper SSPI ... found but cannot be built configure:22016: Basic auth helpers to be built: DB MSNT MSNT-multi-domain NCSA NIS POP3 RADIUS SMB fake getpwnam configure:22069: NTLM auth helper SSPI ... found but cannot be built configure:22074: NTLM auth helpers built: fake smb_lm configure:22128: Negotiate auth helper SSPI ... found but cannot be built configure:22128: Negotiate auth helper kerberos ... found but cannot be built configure:22133: Negotiate auth helpers built: wrapper configure:22187: Digest auth helper LDAP ... found but cannot be built configure:22187: Digest auth helper eDirectory ... found but cannot be built configure:22192: Digest auth helpers built: file configure:22244: Log daemon helpers built: DB file configure:22363: checking for krb5-config configure:22391: result: no configure:23502: external acl helper AD_group ... found but cannot be built configure:23502: external acl helper LDAP_group ... found but cannot be built configure:23502: external acl helper LM_group ... found but cannot be built configure:23502: external acl helper eDirectory_userip ... found but cannot be built configure:23502: external acl helper kerberos_ldap_group ... found but cannot be built configure:23502: external acl helper session ... found but cannot be built configure:23502: external acl helper time_quota ... found but cannot be built configure:23507: External acl helpers built: SQL_session file_userip unix_group wbinfo_group Thanks in advance