Building an agent on FreeBSD 7.3 fails with the following error:

Making all in zabbix_agent
cc -DZABBIX_DAEMON -O2 -fno-strict-aliasing -pipe -I/usr/local/include -L/usr/local/lib -o zabbix_agentd zabbix_agentd-active.o zaix_agentd-cpustat.o zabbix_agentd-diskdevices.o zabbix_agentd-interfaces.o zabbix_agentd-perfstat.o zabbix_agentd-vmstats.o zabbibix_agentd-zabbix_agentd.o zabbix_agentd-zbxconf.o zabbix_agentd-listener.o zabbix_agentd-eventlog.o ../../src/libs/zbxsysinfo/libzsrc/libs/zbxsysinfo/freebsd/libspecsysinfo.a ../../src/libs/zbxsysinfo/common/l src/libs/zbxlog/libzbxlog.a ../../src/libs/zbxalgo/libzbxalgo.a ../../src/libs s/libzbxcomms.a ../../src/libs/zbxconf/libzbxconf.a ../../src/libs/zbxcommon/l /libzbxjson.a -lkvm -lm -ldevstat -liconv
../../src/libs/zbxnix/libzbxnix.a(fatal.o)(.text+0xe2): In function `print_fatal
: undefined reference to `backtrace'
../../src/libs/zbxnix/libzbxnix.a(fatal.o)(.text+0xf6): In function `print_fatal
: undefined reference to `backtrace_symbols'

• • • Error code 1

Problem originally described in http://www.zabbix.com/forum/showthread.php?t=18934.