while compiling svn from source i faced a problem

it might sound trivial as i m a beginner :

./configure worked fine
but while making:

linux-awa5:~/Desktop/subversion-1.4.6 # make
cd subversion/libsvn_subr && /bin/sh /root/Desktop/subversion-1.4.6/libtool --tag=CC --silent --mode=link gcc -g -O2 -pthread -L/usr/lib -rpath /usr/local/lib -o libsvn_subr-1.la auth.lo cmdline.lo compat.lo config.lo config_auth.lo config_file.lo config_win.lo constructors.lo ctype.lo date.lo dso.lo error.lo hash.lo io.lo kitchensink.lo lock.lo md5.lo nls.lo opt.lo path.lo pool.lo prompt.lo quoprint.lo simple_providers.lo sorts.lo ssl_client_cert_providers.lo ssl_client_cert_pw_providers.lo ssl_server_trust_providers.lo stream.lo subst.lo svn_base64.lo svn_string.lo target.lo time.lo user.lo username_providers.lo utf.lo utf_validate.lo validate.lo version.lo xml.lo /usr/lib/libaprutil-1.la -lldap -llber -ldb-4.5 -lexpat /usr/lib/libapr-1.la -lrt -lcrypt -lpthread -ldl -lz
/usr/lib/gcc/i586-suse-linux/4.2.1/../../../../i586-suse-linux/bin/ld: cannot find -lldap
collect2: ld returned 1 exit status
make: *** [subversion/libsvn_subr/libsvn_subr-1.la] Error 1


what is this -lldap and where 2 get it from