gfortran-4.6 software package provides GNU Fortran compiler, 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 gfortran-4.6
gfortran-4.6 is installed in your system.
Make ensure the gfortran-4.6 package were installed using the commands given below,
$ sudo dpkg-query -l | grep gfortran-4.6 *
You will get with gfortran-4.6 package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Development |
| Package | gfortran-4.6 |
| Version | 4.6.3-14 |
| Description | GNU Fortran compiler |
| Sub Section | devel |