$ perl -MNet::SSLeay -le 'print Net::SSLeay::SSL_alert_desc_string_long(1)'
Can't locate auto/Net/SSLeay/SSL_alert_d.al in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5) at -e line 1.
$ perl -MNet::SSLeay -le 'print Net::SSLeay::alert_desc_string_long(1)'
unknown