$is_return_to_valid_against_trust_root = checkTrustRoot($trust_root, $return_to);
To install Net::OpenID::JanRain::Util, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Net::OpenID::JanRain::Util
CPAN shell
perl -MCPAN -e shell install Net::OpenID::JanRain::Util
For more information on module installation, please visit the detailed CPAN module installation guide.