I'am trying to use the configure command with ldap and ads support.
I get the following error:

checking for LDAP support... auto
checking ldap.h usability... yes
checking ldap.h presence... yes
checking for ldap.h... yes
checking lber.h usability... yes
checking lber.h presence... yes
checking for lber.h... yes
checking for ber_scanf in -llber... yes
checking for ldap_init in -lldap... yes
checking for ldap_set_rebind_proc... yes
checking whether ldap_set_rebind_proc takes 3 arguments... 2
checking for ldap_dn2ad_canonical... no
checking whether LDAP support is used... yes
checking for Active Directory and krb5 support... auto
checking for ldap_initialize... no
configure: WARNING: Disabling Active Directory support (requires ldap_initialize)
checking for ldap_add_result_entry... yes

and in the config.log file following ERROR is reported:

configure:35097: checking whether LDAP support is used
configure:35099: result: yes
configure:35122: checking for Active Directory and krb5 support
configure:35136: result: auto
configure:35164: checking for ldap_initialize
configure:35221: gcc -o conftest -O -D_SAMBA_BUILD_ -I/usr/ldap/include -DLDAP_DEPRECATED -L/usr/ldap/lib -L/usr/ldap/lib/aix5 conftest.c
-lldap -llber   >&5
ld: 0711-317 ERROR: Undefined symbol: ldap_initialize
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more information.
collect2: ld returned 8 exit status
configure:35227: $? = 1

I did set the CPPFLAGS="-I/usr/ldap/include"
              LDFLAGS="-L/usr/ldap/lib -L/usr/ldap/aix5"
Running AIX5.3 ML 4
installed krb5.client.rte   1.4.0.2
          ldap.client.rte   5.2.0.0
          ldap.client.adt   5.2.0.0

As you can see I want to make use of the standard AIX krb5 and ldap. Not de opensource.