Very generic advice, assuming that you are using an RPM-based distro, would be to do the following:
Code:
$ rpm -qa | grep popt
This should list all the packages whose names include "popt".
Choose the one you want to remove, and run the following command as root:
Code:
# rpm -e <the_package_name>
This is probably as specfic as it can be, as far as I'm concerned.