now if compile binary from downloaded .tar.gz on developer page http://www.zabbix.com/developers.php then command 'zabbix_server -V' gives result:
Zabbix Server v1.9 (revision 12566) (7 December 2009)
Compilation time: Jun 6 2010 13:03:18

where the revision date is incorrect and is misleading
It would be nice to generate it dynamically as well as the revision number

file "include/common.h" contain fixed time stamp:
#define APPLICATION_NAME "Zabbix Agent"
#define ZABBIX_REVDATE "7 December 2009"
#define ZABBIX_VERSION "1.9"
#define ZABBIX_REVISION "

"