nagios-plugins build failure

[Michael Thomas <wart kobold org>]

I tried a mock build of nagios-plugins for epel5 to test some local 
patches that we're developing, and had the following error:

ERROR: 
Exception(/space/src/fedora/nagios-plugins/EL-5/nagios-plugins-1.4.10-4.el5.1.src.rpm) 
Config(epel-5-i386) 0 minutes 26 seconds
INFO: Results and/or logs in: /space/rpmbuild/mock/epel5/RPMS/i386/
ERROR: Bad build req: No Package Found for perl(Net::SNMP). Exiting.

Indeed, I can't find perl-Net-SNMP in the master repos at 
http://download.fedora.redhat.com/pub/epel/5/i386/, nor is it available 
on my RHEL5 systems via yum.

Where is the buildsys getting this package?

--Wart