[CentOS] missing Nagios dependencies: how to fix on yum?

> run the following command:
> rpm -qa | grep el5


Thank you, Jim.  That "rpm -e" seemed at first to do the trick.  Now more
packages are installed under that version.

I then followed the CentOS 4 instructions at
http://wiki.centos.org/Repositories/RPMForge but "yum install nagios" gives
me the following error.

[root at nagios-server tmp]# yum install nagios
Loading "protectbase" plugin
Setting up Install Process
Setting up repositories
Reading repository metadata in from local files
81 packages excluded due to repository protections
Parsing package install arguments
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Package nagios.i386 0:2.9-1.el5.rf set to be updated
--> Running transaction check
--> Processing Dependency: rtld(GNU_HASH) for package: nagios
--> Processing Dependency: libc.so.6(GLIBC_2.4) for package: nagios
--> Finished Dependency Resolution
Error: Missing Dependency: rtld(GNU_HASH) is needed by package nagios
Error: Missing Dependency: libc.so.6(GLIBC_2.4) is needed by package nagios
[root at nagios-server tmp]#
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