This means the installed *-devel package needs exactly the version of krb5-libs that you have installed, and you were probably trying to install a newer version or remove the version you have. Did you use yum to install your software? You should, because yum takes care of dependencies and installs or upgrades other packages as needed.
sudo yum install packagename
Or use su - and then
yum install packagename
if you're not in the sudoers file.