I need these 2 packages installed on RHEL 6 linux system. They are required by several other programs.
When I do:
sudo yum install glibc-devel
This often occurs when you build software in RHEL 7 and try to run on RHEL 6.
To update GLIBC to any version, simply download the package from
https://ftp.gnu.org/gnu/libc/
For example glibc-2.14.tar.gz in your case.
Then try to run your software, glibc-2.14 should be linked.