To install MooseX::Attribute::TypeConstraint::CustomizeFatal, copy and paste the appropriate command in to your terminal.
cpanm
cpanm MooseX::Attribute::TypeConstraint::CustomizeFatal
CPAN shell
perl -MCPAN -e shell install MooseX::Attribute::TypeConstraint::CustomizeFatal
For more information on module installation, please visit the detailed CPAN module installation guide.