+/*
+** OpenLDAP reentrancy/thread-safeness should be dynamically
+** checked using ldap_get_option().
+**
+** The -lldap implementation may or may not be:
+** LDAP_API_FEATURE_THREAD_SAFE
+**
+** The preprocessor flag LDAP_API_FEATURE_X_OPENLDAP_REENTRANT can
+** be used to determine if -lldap is LDAP_API_FEATURE_THREAD_SAFE at
+** compile time.
+**
+** The -lldap_r implementation is always THREAD_SAFE but
+** may also be:
+** LDAP_API_FEATURE_SESSION_THREAD_SAFE
+** LDAP_API_FEATURE_OPERATION_THREAD_SAFE
+**
+** The preprocessor flag LDAP_API_FEATURE_X_OPENLDAP_THREAD_SAFE
+** can be used to determine if -lldap_r is available at compile
+** time. You must define LDAP_THREAD_SAFE if and only if you
+** link with -lldap_r.
+**
+** If you fail to define LDAP_THREAD_SAFE when linking with
+** -lldap_r or define LDAP_THREAD_SAFE when linking with -lldap,
+** provided header definations and declarations may be incorrect.
+**
+*/
+
+/* is -lldap reentrant or not */
+#undef LDAP_API_FEATURE_X_OPENLDAP_REENTRANT
+
+/* is threadsafe version of -lldap (ie: -lldap_r) *available* or not */
+#undef LDAP_API_FEATURE_X_OPENLDAP_THREAD_SAFE
+