YAML-LibYAML prior to 0.903.0 for Perl uses 2-args open, allowing existing files to be modified
To install YAML::LibYAML, copy and paste the appropriate command in to your terminal.
cpanm
cpanm YAML::LibYAML
CPAN shell
perl -MCPAN -e shell install YAML::LibYAML
For more information on module installation, please visit the detailed CPAN module installation guide.