All, A small typo in ldap/libraries/liblthread/thr_posix.c. On line 30: ldap_pvt_thread_set_concurrency(int n) it should say: ldap_pvt_thread_setconcurrency(int n) This is with a CVS checkout of OPENLDAP_REL_ENG_1_2. It causes a link failure on my platform (OSF1 v4.0). I configured as so: LDFLAGS="-L/usr/local/lib -lpthread -lexc" CPPFLAGS="-I/usr/local/include" ./configure --with-ldbm-api=gdbm --with-threads=posix -seth