explain software package provides utility to explain system call errors, 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 explain
explain is installed in your system.
Make ensure the explain package were installed using the commands given below,
$ sudo dpkg-query -l | grep explain *
You will get with explain package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Development |
| Package | explain |
| Version | 0.52.D002-1 |
| Description | utility to explain system call errors |
| Sub Section | devel |