Failed dependencies trying to install package 'libxml2'

I am trying to install libxml2, but my system complains about dependencies. The dependent packages exist on system. The ultimate goal is to install xml_grep2, I have been trying various methods (cpan, etc). [root@testserver xml]# rpm -ivh libxml2-2.9.0-1.x86_64.rpm warning: libxml2-2.9.0-1.x86_64.rpm: Header V4 DSA signature: NOKEY, key ID de95bc1f error: Failed dependencies: libc.so.6(GLIBC_2.14)(64bit) is needed by libxml2-2.9.0-1.x86_64 [root@testserver xml]# yum install glibc Package glibc-2.5-107.x86_64 already installed and latest version Package glibc-2.5-107.i686 already installed and latest version [root@testserver xml]# find / -name libc.so.6 /lib64/libc.so.6 /lib/libc.so.6 /lib/i686/nosegneg/libc.so.6