Found the really, really stupid bug. The SAFEMEMCPY macro

clients/gopher/go500.c

clients/gopher/go500gw.c

clients/rcpt500/query.c

clients/ud/auth.c

clients/ud/edit.c

clients/ud/group.c

clients/ud/mod.c

clients/ud/print.c

include/ac/string.h

include/lutil_sha1.h

libraries/libldap/os-ip.c

libraries/libldap/sort.c

servers/slapd/back-ldbm/bind.c

servers/slapd/connection.c

servers/slapd/daemon.c

servers/slapd/main.c

servers/slapd/tools/ldbmtest.c

servers/slurpd/admin.c

servers/slurpd/fm.c

servers/slurpd/main.c