Crypt::OpenSSL::X509 (Crypt::OpenSSL::X509)
Установка FreeBSD
cd /usr/ports/security/p5-Crypt-OpenSSL-X509/ && make && make install
Установка Ubuntu, Debian
apt-get install libcrypt-openssl-x509-perl
Установка с CPAN
perl -MCPAN -e shell install Crypt::OpenSSL::X509