The newer OpenLDAP releases deprecated some of the functions that are being used by e-d-s and Evolution. To be able to access them without getting "implicit declaration of foo()" you have to check for the new version and #define LDAP_DEPRECATED if building against it.

e-book-backend-ldap.c: In function 'check_schema_support':
e-book-backend-ldap.c:527: warning: implicit declaration of function 'ldap_get_values'
e-book-backend-ldap.c:527: warning: assignment makes pointer from integer without a cast
e-book-backend-ldap.c:562: warning: implicit declaration of function 'ldap_value_free'
e-book-backend-ldap.c: In function 'get_ldap_library_info':
e-book-backend-ldap.c:594: warning: implicit declaration of function 'ldap_init'
e-book-backend-ldap.c:594: warning: assignment makes pointer from integer without a cast
e-book-backend-ldap.c:624: warning: implicit declaration of function 'ldap_unbind'
e-book-backend-ldap.c: In function 'query_ldap_root_dse':
e-book-backend-ldap.c:670: warning: assignment makes pointer from integer without a cast
e-book-backend-ldap.c:679: warning: assignment makes pointer from integer without a cast
e-book-backend-ldap.c:692: warning: assignment makes pointer from integer without a cast
e-book-backend-ldap.c:717: warning: assignment makes pointer from integer without a cast
e-book-backend-ldap.c:722: warning: assignment makes pointer from integer without a cast
e-book-backend-ldap.c: In function 'e_book_backend_ldap_connect':
e-book-backend-ldap.c:758: warning: assignment makes pointer from integer without a cast
e-book-backend-ldap.c:822: warning: implicit declaration of function 'ldap_simple_bind_s'
e-book-backend-ldap.c: In function 'ldap_op_finished':
e-book-backend-ldap.c:1009: warning: implicit declaration of function 'ldap_abandon'
e-book-backend-ldap.c: In function 'build_contact_from_entry':
e-book-backend-ldap.c:3439: warning: assignment makes pointer from integer without a cast
e-book-backend-ldap.c:3469: warning: assignment makes pointer from integer without a cast
e-book-backend-ldap.c: In function 'e_book_backend_ldap_authenticate_user':
e-book-backend-ldap.c:4046: warning: implicit declaration of function 'ldap_search_s'
e-book-backend-ldap.c: At top level:
e-book-backend-ldap.c:4379: warning: 'stop_views' defined but not used
e-book-backend-ldap.c:4398: warning: 'start_views' defined but not used