I've downloaded the Zabbix 1.6.6 binary from the public download page and I get the following error when trying to run zabbix_agentd:

-bash-3.00$ ./zabbix_agentd
ld.so.1: zabbix_agentd: fatal: libresolv.so.2: version `SUNW_2.3' not found (required by file zabbix_agentd)
...