Newbie: http start fail: Invalid command 'log_file=/var/log/nagios/nagios.log'

[nic gna]

Why am I getting this error?  
   
  $ /etc/init.d/httpd start
Stopping httpd: [FAILED]
Starting httpd: Syntax error on line 19 of /etc/nagios/nagios.cfg:
Invalid command 'log_file=/var/log/nagios/nagios.log', perhaps mis-spelled or defined by a 
  module not included in the server configuration
  [FAILED]
   
  This is line 19 of the nagios.cfg.
log_file=/var/log/nagios/nagios.log

 
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