As far as I can see (with a little research on some tickets) lib nunc-stans is now enabled by default in 389 (389-ds-base) and I'm trying to compiling it on ubuntu 16.04 and was getting the following error:

/.libs/libnunc-stans.so: undefined reference to `event_add'
./.libs/libnunc-stans.so: undefined reference to `event_base_loop'
./.libs/libnunc-stans.so: undefined reference to `event_set_log_callback'
./.libs/libnunc-stans.so: undefined reference to `event_base_free'
./.libs/libnunc-stans.so: undefined reference to `event_assign'
./.libs/libnunc-stans.so: undefined reference to `event_set_mem_functions'
./.libs/libnunc-stans.so: undefined reference to `event_base_new'
./.libs/libnunc-stans.so: undefined reference to `event_del'
collect2: error: ld returned 1 exit status


Nunc-stans depends on libevent-dev (at least on ubuntu):

gcc -g -O2 -o .libs/ns-slapd ldap/servers/slapd/ns_slapd-abandon.o ldap/servers/slapd/ns_slapd-auth.o ldap/servers/slapd/ns_slapd-bind.o ldap/servers/slapd/ns_slapd-compare.o ldap/servers/slapd/ns_slapd-config.o ldap/servers/slapd/ns_slapd-configdse.o ldap/servers/slapd/ns_slapd-connection.o ldap/servers/slapd/ns_slapd-conntable.o ldap/servers/slapd/ns_slapd-daemon.o ldap/servers/slapd/ns_slapd-detach.o ldap/servers/slapd/ns_slapd-extendop.o ldap/servers/slapd/ns_slapd-fedse.o ldap/servers/slapd/ns_slapd-fileio.o ldap/servers/slapd/ns_slapd-getopt_ext.o ldap/servers/slapd/ns_slapd-globals.o ldap/servers/slapd/ns_slapd-house.o ldap/servers/slapd/ns_slapd-init.o ldap/servers/slapd/ns_slapd-main.o ldap/servers/slapd/ns_slapd-monitor.o ldap/servers/slapd/ns_slapd-passwd_extop.o ldap/servers/slapd/ns_slapd-psearch.o ldap/servers/slapd/ns_slapd-pw_mgmt.o ldap/servers/slapd/ns_slapd-pw_verify.o ldap/servers/slapd/ns_slapd-rootdse.o ldap/servers/slapd/ns_slapd-sasl_io.o ldap/servers/slapd/ns_slapd-saslbind.o ldap/servers/slapd/ns_slapd-search.o ldap/servers/slapd/ns_slapd-start_tls_extop.o ldap/servers/slapd/ns_slapd-strdup.o ldap/servers/slapd/ns_slapd-stubs.o ldap/servers/slapd/ns_slapd-tempnam.o ldap/servers/slapd/ns_slapd-unbind.o ldap/servers/slapd/ns_slapd-getsocketpeer.o  ./.libs/libnunc-stans.so ./.libs/libslapd.so ./.libs/libldaputil.so -lldap_r -llber -lssl3 -lnss3 -ldl -lplc4 -lplds4 -lnspr4 -lsasl2 -L/usr/lib/x86_64-linux-gnu/ -lsvrcore -lpthread -Wl,-rpath -Wl,/opt/dirsrv/lib/dirsrv

Seems to be missing the libevent(-levent), my workaround was to add it manually:

LIBS=-levent ./configure

I'm not sure if is an expected behavior, but anyway I just want to share my workaround.

Cheers,

Alberto Viana