grass-gui software package provides GRASS GIS graphical user interfaces, 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 grass-gui
grass-gui is installed in your system.
Make ensure the grass-gui package were installed using the commands given below,
$ sudo dpkg-query -l | grep grass-gui *
You will get with grass-gui package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Science |
| Package | grass-gui |
| Version | 6.4.2-2 |
| Description | GRASS GIS graphical user interfaces |
| Sub Section | Science |