freeradius compile problem with ldap

[nopadol]

i wanna used freeradius with ldap. I start compile with these command :   #./configure --prefix=/usr/local/freeradius --with-gnu-ld --enable-static-modul es --with-ldap --enable-ltdl-install > out and output is configure: warning: the comm_err library isn't found! configure: warning: silently not building rlm_krb5. configure: warning: FAILURE: rlm_krb5 requires:  krb5. configure: warning: silently not building rlm_ldap. configure: warning: FAILURE: rlm_ldap requires:  libldap_r.   what should i do for this problem? or What option i should have in my configure command ? :-)