libperlx-maybe-perl software package provides return a pair only if they are both defined, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libperlx-maybe-perl
libperlx-maybe-perl is installed in your system.
Make ensure the libperlx-maybe-perl package were installed using the commands given below,
$ sudo dpkg-query -l | grep libperlx-maybe-perl *
You will get with libperlx-maybe-perl package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Perl |
| Package | libperlx-maybe-perl |
| Version | 0.004-1 |
| Description | return a pair only if they are both defined |
| Sub Section | Perl |
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