libclass-contract-perl software package provides Design-by-Contract OO in Perl, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libclass-contract-perl
libclass-contract-perl is installed in your system.
Make ensure the libclass-contract-perl package were installed using the commands given below,
$ sudo dpkg-query -l | grep libclass-contract-perl *
You will get with libclass-contract-perl package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Perl |
| Package | libclass-contract-perl |
| Version | 1.14-6 |
| Description | Design-by-Contract OO in Perl |
| Sub Section | Perl |