http://nagios/pnp -> "Hostname is not set" (using CentOS 4 / NagiosQL / Nagios 2.10)

[Roger]

I recently installed PNP for Nagios and am having problems with the RRD
output displaying. I installed Nagios 2.10 from package on CentOS 4 (via
RPMforge). Everything works well with NagiosQL.

Per this doc, http://www.ederdrom.de/pnp/doc_complete

I downloaded the PNP code and ran "./configure" and then "make all && make
install" This, by default, installed everything into /usr/local/nagios/pnp/

I made a sym link: ln -s /usr/local/nagios/share/pnp /var/www/html/pnp
(because the PHP front end files are located there)

And I also made the default checks that the documentation told me to make
the following changes in /etc/nagios/nagios.cfg

 process_performance_data=1


 service_perfdata_command=process-service-perfdata

And in NagiosQL, I made the following definitions in  the commands -
CheckCommands section.

define command {
  command_name    process-service-perfdata
  command_line    /usr/bin/perl /usr/local/nagios/libexec/process_perfdata.pl
}

define command {
  command_name    process-host-perfdata
  command_line    /usr/bin/perl
/usr/local/nagios/libexec/process_perfdata.pl -d HOSTPERFDATA
}


And in NagiosQL's specialty - Service Ext Info, I made the following entry
(modified for my environment)

define serviceextinfo {
  host_name             mybox.mydomain.com
  service_description   check_load
  action_url            /nagios/pnp/index.php?host=$HOSTNAME$&srv=$SERVICEDESC$
}


Now when I got to http://nagiosBox/pnp <http://nagiosBox/nagios/pnp> I get
the following error: "Hostname is not set".

Where do I set this HOSTNAME variable? Is this part of the Service Ext Info
part?  Or is this parameter somehow not being properly passed to the PNP/PHP
scripts?
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