[squid-users] Errors compiling squid

Hello,

compiling squid (version 2.5.STABLE3) configured with
--enable-basic-auth-helpers=<helpers> I receive compiling errors of type
"FATAL: <file>.h not found"
with helper LDAP the files are: ldap.h and lber.h
with helper PAM the file is: pam_appl.h
with helper SASL the file is: sasl.h
I suppose I need some libabry in order to compile squid with this
options, is it correct? In this case, which libraries I need?

Thnak you for your time,
Daniele Ricci.