Misconfiguration with libcurl v7.28.1 causes a HTTPS validation issues.
To install LWP::Protocol::Net::Curl, copy and paste the appropriate command in to your terminal.
cpanm
cpanm LWP::Protocol::Net::Curl
CPAN shell
perl -MCPAN -e shell install LWP::Protocol::Net::Curl
For more information on module installation, please visit the detailed CPAN module installation guide.