[Resolved]Perl module Authen:OATH needed for two-factor auth

[ThinkFast]

[Apologize for my ignorance]
I'm trying to setup Two-factor authentication for use with Webmin.

Two-factor authentication allows Webmin users to enable use of an additional authentication device when logging in, such as a one-time passcode generator.

In Webmin 1.660, I went to Webmin configuration. Then I selected Two-Factor Authentication:

Users must individually enroll with the selected authentication provider after it is enabled on this page.
Chose Google Authenticator from drop down.

Failed to save two-factor authentication : The Perl module Authen::OATH needed for two-factor authentication is not installed. Use the Perl Modules page in Webmin to install it.

Not sure how to install the Authen::OATH module. I located the package on CPAN. What is the preferred package installer to use (app-get, Yaourt)?
Please advise.