Hi, While compiling freeradius, ldap module failed to build with below error interpreted with configure: === configuring in src/modules/rlm_ldap (/home/u5496622/freeradius-server-release_3_0_17/src/modules/rlm_ldap) configure: running /bin/sh ./configure --disable-option-checking '--prefix=/usr/app/radius' --cache-file=/dev/null --srcdir=. checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for ldap_init in -lldap... no checking for ldap_init in -lldap in /usr/local/lib... no checking for ldap_init in -lldap in /opt/lib... no checking for ldap.h... no checking for ldap.h in /usr/local/include/... no checking for ldap.h in /opt/include/... no checking for sasl/sasl.h... no checking for sasl/sasl.h in /usr/local/include/... no checking for sasl/sasl.h in /opt/include/... no configure: WARNING: silently not building rlm_ldap. configure: WARNING: FAILURE: rlm_ldap requires: libldap ldap.h. configure: creating ./config.status config.status: creating all.mk config.status: creating config.h config.status: config.h is unchanged Which additional package is needed to complete ldap build..? ---- *Thanks & Kind Regards,* Saurabh LAHOTI. *Ideas enlighten Innovation**!!!* Please consider the environment before printing this mail..!!